INVERTIR UNA CADENA EN C

Este tema analizará varias formas de invertir una cadena en el lenguaje de programación C. Invertir una cuerda es la técnica que invierte o cambia el orden de una cadena determinada de modo que el último carácter de la cadena se convierta en el primer carácter de la cadena y así sucesivamente. Además, también podemos comprobar el palíndromo de la cadena dada invirtiendo la cadena original.

Por ejemplo, ingresamos una cadena ' MANZANA ', y luego use el algoritmo inverso. El algoritmo inverso devuelve la cadena ' ELPPA ' que es completamente inverso a la cadena original.

Diferentes formas de encontrar el reverso de una cuerda en C

A continuación se muestran varias formas de encontrar el reverso de una cadena en el lenguaje de programación C:

Invertir una cadena usando la función strrev()
Invertir una cadena sin usar la función de biblioteca
Invertir una cadena usando la función recursiva
Invertir una cadena usando el bucle for
Invertir una cadena usando el bucle while
Invertir una cadena usando punteros
Invertir una cadena para buscar palíndromo

Programa 1: Imprima el reverso de una cadena usando la función strrev()

Consideremos un ejemplo para imprimir el reverso de una cadena usando la función strrev().

Programa1.c

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 #include #include int main() { char str[40]; // declare the size of character string printf (&apos; 
 Enter a string to be reversed: &apos;); scanf (&apos;%s&apos;, str); // use strrev() function to reverse a string printf (&apos; 
 After the reverse of a string: %s &apos;, strrev(str)); return 0; }

Producción

 Enter a string to be reversed: AMBULANCE After the reverse of a string: ECNALUBMA

Programa 2: Imprime el reverso de una cadena sin usar la función de biblioteca

Consideremos un ejemplo para imprimir el reverso de una cadena usando una función definida por el usuario.

Programa2.c

 #include #include // function definition of the revstr() void revstr(char *str1) { // declare variable int i, len, temp; len = strlen(str1); // use strlen() to get the length of str string // use for loop to iterate the string for (i = 0; i <len 2; i++) { temp variable use to temporary hold the string str1[i]="str1[len" - i 1]; str1[len 1]="temp;" } int main() char str[50]; size of printf (' enter string: '); gets(str); gets() function take 
 before reversing %s 
', str); call revstr() revstr(str); after %s', < pre> <p> <strong>Output</strong> </p> <pre> Enter the string: Welcome Friends Before reversing the string: Welcome Friends After reversing the string: sdneirF emocleW </pre> <h3>Program 3: Print the reverse of a string using the recursion function</h3> <p>Let&apos;s consider an example to print the reverse of a string using the recursion function.</p> <p> <strong>Recursion function:</strong> A recursion function is a function that continuously calls the same function without using a looping statement.</p> <p> <strong>Program3.c</strong> </p> <pre> #include #include // use recursion function void revstr(char *str1) { // declare static variable static int i, len, temp; len = strlen(str1); // use strlen() to get the length of str string if (i <len 2){ temp variable use to temporary hold the string str1[i]="str1[len" - i 1]; str1[len 1]="temp;" i++; revstr(str1); recusively calls revstr() function } int main() { char str1[50]; size of printf (' enter string: '); gets(str1); gets() take 
 before reversing %s 
', str1); call after %s', < pre> <p> <strong>Output</strong> </p> <pre> Enter the string: LIFE INSURANCE Before reversing the string: LIFE INSURANCE After reversing the string: ECNARUSNI EFIL </pre> <h3>Program 4: Print the reverse of a string using for loop</h3> <p>Let&apos;s consider an example to print the reverse of a string using for loop in C programming language.</p> <p> <strong>Program4.c</strong> </p> <pre> #include #include #include void main() { char str[50], temp; // define the size of str[] array int i, left, right, len; printf (&apos; 
 Display a reverse string in the C: 
&apos;); printf (&apos; ----------------------- &apos;); printf (&apos; 
 Enter a string to reverse order: &apos;); scanf( &apos;%s&apos;, &amp;str); len = strlen(str); // get the length of the string left = 0; // set left index at 0 right = len - 1; // set right index len - 1 // use for loop to store the reverse string for (i = left; i <right; i++) { temp="str[i];" str[i]="str[right];" str[right]="temp;" right--; } printf (' the reverse of original string is: %s ', str); getch(); < pre> <p> <strong>Output</strong> </p> <pre> Display a reverse string in the C: ----------------------- Enter a string to reverse order: APPLE The reverse of the original string is: ELPPA </pre> <h3>Program 5: Print the reverse of a string using while loop</h3> <p>Let&apos;s consider an example to print the reverse of a string using while loop in C programming language.</p> <p> <strong>Program5.c</strong> </p> <pre> #include #include int main() { char str1[50], temp; // declare and initialize the size of string array. int i = 0, j =0; printf (&apos; Enter a string to be reversed: &apos;); scanf( &apos;%s&apos;, str1); j = strlen (str1) - 1; // get the length of the string // use while loop to define the condition while ( i <j) 1 { use temp variable to store the characters of str1 str1[j]="str1[i];" str1[i]="temp;" i++; i incremented by j--; j is decremented } printf (' reversed string: %s', str1); return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string to be reversed: JAVATPOINT The reversed of the string: TNIOPTAVAJ </pre> <h3>Program 6: Print the reverse of a string using pointers</h3> <p>Let&apos;s consider an example to print the reverse of a string using pointers in the C programming language.</p> <p> <strong>Program6.c</strong> </p> <pre> #include #include int str_len( char *st); void revstr( char *st); int main() { char st[50]; printf (&apos; Enter a string to be reversed: &apos;); scanf( &apos;%s&apos;, st); revstr(st); printf (&apos; The reverse string is: %s&apos;, st); return 0; } void revstr (char *st) { int len, i; char *start, *end, temp; len = str_len (st); start = st; end = st; for (i = 0; i <len - 1; i++) end++; for (i="0;" i < len 2; { temp="*end;" *end="*start;" *start="temp;" start++; end--; } int str_len (char *ptr) while ( *(ptr + i) !="" ) i++; return i; pre> <p> <strong>Output</strong> </p> <pre> Enter a string to be reversed: JAVATPOINT The reverse string is: TNIOPTAVAJ </pre> <h3>Program 7: Program to check whether the reverse string is a Palindrome</h3> <p>Consider a program to check whether the given string is a palindrome or not in the C programming language.</p> <p> <strong>Program7.c</strong> </p> <pre> #include #include int main () { // declare variables char str1[30]; int i, len, flag = 0; printf (&apos; Enter a string: &apos;); scanf (&apos;%s&apos;, str1); len = strlen( str1 ); // get the string length for ( i = 0; i <len; i++) { str1[i] is not equal to str1[len-i-1] if (str1[i] !="str1[len" - i 1]) flag="1;" break; exit from statement } (flag) printf (' %s a palindrome string', str1); else palindrome', return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string: madam madam is a palindrome string. </pre> <hr></len;></pre></len></pre></j)></pre></right;></pre></len></pre></len>

Programa 3: imprime el reverso de una cadena usando la función de recursividad

Consideremos un ejemplo para imprimir el reverso de una cadena usando la función de recursividad.

Función recursiva: Una función recursiva es una función que llama continuamente a la misma función sin utilizar una declaración de bucle.

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Programa3.c

 #include #include // use recursion function void revstr(char *str1) { // declare static variable static int i, len, temp; len = strlen(str1); // use strlen() to get the length of str string if (i <len 2){ temp variable use to temporary hold the string str1[i]="str1[len" - i 1]; str1[len 1]="temp;" i++; revstr(str1); recusively calls revstr() function } int main() { char str1[50]; size of printf (\' enter string: \'); gets(str1); gets() take 
 before reversing %s 
\', str1); call after %s\', < pre> <p> <strong>Output</strong> </p> <pre> Enter the string: LIFE INSURANCE Before reversing the string: LIFE INSURANCE After reversing the string: ECNARUSNI EFIL </pre> <h3>Program 4: Print the reverse of a string using for loop</h3> <p>Let&apos;s consider an example to print the reverse of a string using for loop in C programming language.</p> <p> <strong>Program4.c</strong> </p> <pre> #include #include #include void main() { char str[50], temp; // define the size of str[] array int i, left, right, len; printf (&apos; 
 Display a reverse string in the C: 
&apos;); printf (&apos; ----------------------- &apos;); printf (&apos; 
 Enter a string to reverse order: &apos;); scanf( &apos;%s&apos;, &amp;str); len = strlen(str); // get the length of the string left = 0; // set left index at 0 right = len - 1; // set right index len - 1 // use for loop to store the reverse string for (i = left; i <right; i++) { temp="str[i];" str[i]="str[right];" str[right]="temp;" right--; } printf (\' the reverse of original string is: %s \', str); getch(); < pre> <p> <strong>Output</strong> </p> <pre> Display a reverse string in the C: ----------------------- Enter a string to reverse order: APPLE The reverse of the original string is: ELPPA </pre> <h3>Program 5: Print the reverse of a string using while loop</h3> <p>Let&apos;s consider an example to print the reverse of a string using while loop in C programming language.</p> <p> <strong>Program5.c</strong> </p> <pre> #include #include int main() { char str1[50], temp; // declare and initialize the size of string array. int i = 0, j =0; printf (&apos; Enter a string to be reversed: &apos;); scanf( &apos;%s&apos;, str1); j = strlen (str1) - 1; // get the length of the string // use while loop to define the condition while ( i <j) 1 { use temp variable to store the characters of str1 str1[j]="str1[i];" str1[i]="temp;" i++; i incremented by j--; j is decremented } printf (\' reversed string: %s\', str1); return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string to be reversed: JAVATPOINT The reversed of the string: TNIOPTAVAJ </pre> <h3>Program 6: Print the reverse of a string using pointers</h3> <p>Let&apos;s consider an example to print the reverse of a string using pointers in the C programming language.</p> <p> <strong>Program6.c</strong> </p> <pre> #include #include int str_len( char *st); void revstr( char *st); int main() { char st[50]; printf (&apos; Enter a string to be reversed: &apos;); scanf( &apos;%s&apos;, st); revstr(st); printf (&apos; The reverse string is: %s&apos;, st); return 0; } void revstr (char *st) { int len, i; char *start, *end, temp; len = str_len (st); start = st; end = st; for (i = 0; i <len - 1; i++) end++; for (i="0;" i < len 2; { temp="*end;" *end="*start;" *start="temp;" start++; end--; } int str_len (char *ptr) while ( *(ptr + i) !="" ) i++; return i; pre> <p> <strong>Output</strong> </p> <pre> Enter a string to be reversed: JAVATPOINT The reverse string is: TNIOPTAVAJ </pre> <h3>Program 7: Program to check whether the reverse string is a Palindrome</h3> <p>Consider a program to check whether the given string is a palindrome or not in the C programming language.</p> <p> <strong>Program7.c</strong> </p> <pre> #include #include int main () { // declare variables char str1[30]; int i, len, flag = 0; printf (&apos; Enter a string: &apos;); scanf (&apos;%s&apos;, str1); len = strlen( str1 ); // get the string length for ( i = 0; i <len; i++) { str1[i] is not equal to str1[len-i-1] if (str1[i] !="str1[len" - i 1]) flag="1;" break; exit from statement } (flag) printf (\' %s a palindrome string\', str1); else palindrome\', return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string: madam madam is a palindrome string. </pre> <hr></len;></pre></len></pre></j)></pre></right;></pre></len>

Programa 4: imprime el reverso de una cadena usando el bucle for

Consideremos un ejemplo para imprimir el reverso de una cadena usando un bucle for en el lenguaje de programación C.

Programa4.c

 #include #include #include void main() { char str[50], temp; // define the size of str[] array int i, left, right, len; printf (&apos; 
 Display a reverse string in the C: 
&apos;); printf (&apos; ----------------------- &apos;); printf (&apos; 
 Enter a string to reverse order: &apos;); scanf( &apos;%s&apos;, &amp;str); len = strlen(str); // get the length of the string left = 0; // set left index at 0 right = len - 1; // set right index len - 1 // use for loop to store the reverse string for (i = left; i <right; i++) { temp="str[i];" str[i]="str[right];" str[right]="temp;" right--; } printf (\' the reverse of original string is: %s \', str); getch(); < pre> <p> <strong>Output</strong> </p> <pre> Display a reverse string in the C: ----------------------- Enter a string to reverse order: APPLE The reverse of the original string is: ELPPA </pre> <h3>Program 5: Print the reverse of a string using while loop</h3> <p>Let&apos;s consider an example to print the reverse of a string using while loop in C programming language.</p> <p> <strong>Program5.c</strong> </p> <pre> #include #include int main() { char str1[50], temp; // declare and initialize the size of string array. int i = 0, j =0; printf (&apos; Enter a string to be reversed: &apos;); scanf( &apos;%s&apos;, str1); j = strlen (str1) - 1; // get the length of the string // use while loop to define the condition while ( i <j) 1 { use temp variable to store the characters of str1 str1[j]="str1[i];" str1[i]="temp;" i++; i incremented by j--; j is decremented } printf (\' reversed string: %s\', str1); return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string to be reversed: JAVATPOINT The reversed of the string: TNIOPTAVAJ </pre> <h3>Program 6: Print the reverse of a string using pointers</h3> <p>Let&apos;s consider an example to print the reverse of a string using pointers in the C programming language.</p> <p> <strong>Program6.c</strong> </p> <pre> #include #include int str_len( char *st); void revstr( char *st); int main() { char st[50]; printf (&apos; Enter a string to be reversed: &apos;); scanf( &apos;%s&apos;, st); revstr(st); printf (&apos; The reverse string is: %s&apos;, st); return 0; } void revstr (char *st) { int len, i; char *start, *end, temp; len = str_len (st); start = st; end = st; for (i = 0; i <len - 1; i++) end++; for (i="0;" i < len 2; { temp="*end;" *end="*start;" *start="temp;" start++; end--; } int str_len (char *ptr) while ( *(ptr + i) !="" ) i++; return i; pre> <p> <strong>Output</strong> </p> <pre> Enter a string to be reversed: JAVATPOINT The reverse string is: TNIOPTAVAJ </pre> <h3>Program 7: Program to check whether the reverse string is a Palindrome</h3> <p>Consider a program to check whether the given string is a palindrome or not in the C programming language.</p> <p> <strong>Program7.c</strong> </p> <pre> #include #include int main () { // declare variables char str1[30]; int i, len, flag = 0; printf (&apos; Enter a string: &apos;); scanf (&apos;%s&apos;, str1); len = strlen( str1 ); // get the string length for ( i = 0; i <len; i++) { str1[i] is not equal to str1[len-i-1] if (str1[i] !="str1[len" - i 1]) flag="1;" break; exit from statement } (flag) printf (\' %s a palindrome string\', str1); else palindrome\', return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string: madam madam is a palindrome string. </pre> <hr></len;></pre></len></pre></j)></pre></right;>

Programa 5: imprime el reverso de una cadena usando el bucle while

Consideremos un ejemplo para imprimir el reverso de una cadena usando el bucle while en el lenguaje de programación C.

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Programa5.c

 #include #include int main() { char str1[50], temp; // declare and initialize the size of string array. int i = 0, j =0; printf (&apos; Enter a string to be reversed: &apos;); scanf( &apos;%s&apos;, str1); j = strlen (str1) - 1; // get the length of the string // use while loop to define the condition while ( i <j) 1 { use temp variable to store the characters of str1 str1[j]="str1[i];" str1[i]="temp;" i++; i incremented by j--; j is decremented } printf (\' reversed string: %s\', str1); return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string to be reversed: JAVATPOINT The reversed of the string: TNIOPTAVAJ </pre> <h3>Program 6: Print the reverse of a string using pointers</h3> <p>Let&apos;s consider an example to print the reverse of a string using pointers in the C programming language.</p> <p> <strong>Program6.c</strong> </p> <pre> #include #include int str_len( char *st); void revstr( char *st); int main() { char st[50]; printf (&apos; Enter a string to be reversed: &apos;); scanf( &apos;%s&apos;, st); revstr(st); printf (&apos; The reverse string is: %s&apos;, st); return 0; } void revstr (char *st) { int len, i; char *start, *end, temp; len = str_len (st); start = st; end = st; for (i = 0; i <len - 1; i++) end++; for (i="0;" i < len 2; { temp="*end;" *end="*start;" *start="temp;" start++; end--; } int str_len (char *ptr) while ( *(ptr + i) !="" ) i++; return i; pre> <p> <strong>Output</strong> </p> <pre> Enter a string to be reversed: JAVATPOINT The reverse string is: TNIOPTAVAJ </pre> <h3>Program 7: Program to check whether the reverse string is a Palindrome</h3> <p>Consider a program to check whether the given string is a palindrome or not in the C programming language.</p> <p> <strong>Program7.c</strong> </p> <pre> #include #include int main () { // declare variables char str1[30]; int i, len, flag = 0; printf (&apos; Enter a string: &apos;); scanf (&apos;%s&apos;, str1); len = strlen( str1 ); // get the string length for ( i = 0; i <len; i++) { str1[i] is not equal to str1[len-i-1] if (str1[i] !="str1[len" - i 1]) flag="1;" break; exit from statement } (flag) printf (\' %s a palindrome string\', str1); else palindrome\', return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string: madam madam is a palindrome string. </pre> <hr></len;></pre></len></pre></j)>

Programa 6: Imprime el reverso de una cadena usando punteros

Consideremos un ejemplo para imprimir el reverso de una cadena usando punteros en el lenguaje de programación C.

Programa6.c

 #include #include int str_len( char *st); void revstr( char *st); int main() { char st[50]; printf (&apos; Enter a string to be reversed: &apos;); scanf( &apos;%s&apos;, st); revstr(st); printf (&apos; The reverse string is: %s&apos;, st); return 0; } void revstr (char *st) { int len, i; char *start, *end, temp; len = str_len (st); start = st; end = st; for (i = 0; i <len - 1; i++) end++; for (i="0;" i < len 2; { temp="*end;" *end="*start;" *start="temp;" start++; end--; } int str_len (char *ptr) while ( *(ptr + i) !="" ) i++; return i; pre> <p> <strong>Output</strong> </p> <pre> Enter a string to be reversed: JAVATPOINT The reverse string is: TNIOPTAVAJ </pre> <h3>Program 7: Program to check whether the reverse string is a Palindrome</h3> <p>Consider a program to check whether the given string is a palindrome or not in the C programming language.</p> <p> <strong>Program7.c</strong> </p> <pre> #include #include int main () { // declare variables char str1[30]; int i, len, flag = 0; printf (&apos; Enter a string: &apos;); scanf (&apos;%s&apos;, str1); len = strlen( str1 ); // get the string length for ( i = 0; i <len; i++) { str1[i] is not equal to str1[len-i-1] if (str1[i] !="str1[len" - i 1]) flag="1;" break; exit from statement } (flag) printf (\' %s a palindrome string\', str1); else palindrome\', return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string: madam madam is a palindrome string. </pre> <hr></len;></pre></len>

Programa 7: Programa para comprobar si la cadena inversa es un palíndromo

Considere un programa para comprobar si la cadena dada es un palíndromo o no en el lenguaje de programación C.

Programa7.c

 #include #include int main () { // declare variables char str1[30]; int i, len, flag = 0; printf (&apos; Enter a string: &apos;); scanf (&apos;%s&apos;, str1); len = strlen( str1 ); // get the string length for ( i = 0; i <len; i++) { str1[i] is not equal to str1[len-i-1] if (str1[i] !="str1[len" - i 1]) flag="1;" break; exit from statement } (flag) printf (\\' %s a palindrome string\\', str1); else palindrome\\', return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a string: madam madam is a palindrome string. </pre> <hr></len;>

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