Write a C program to reverse a given string without using any built-in functions.

Question

Aryan Kumar · Answer

#include andlt;stdio.h>
#include andlt;string.h>
void reverse(char *str);
int main() {
   char str[100];
   printf("Enter a string: ");
   fgets(str, sizeof(str), stdin);
   printf("Original string: %s", str);
   reverse(str);
   printf("Reversed string: %s", str);
   return 0;
}
void reverse(char *str) {
   int len = strlen(str);
   for (int i = 0; i andlt; len / 2; i++) {
       char temp = str[i];
       str[i] = str[len - i - 1];
       str[len - i - 1] = temp;
   }
}
and

Krishnapriya Rajeev · Answer

In C programming, a string is a one-dimensional array of characters. As a result, one can reverse a string using a for loop that decrements the variable over which the loop is iterated.
An example of such a code is:
#include andlt;stdio.h>
#include andlt;string.h>
int main(){
  char str[100], rev[100];
  int i, j, len;
  printf("Enter a string: ");
  scanf(“%s”, str);and and and and and and  // read string from user
  len = strlen(str);and and and and and  // calculate length of string
  j = 0;
  for(i = len - 1; i >= 0; i--){
     rev[j++] = str[i];
  }
  rev[j] = '\0';
  printf("Reverse of the string: %s", rev);
  return 0;
}
// Output = Enter string: hello
 and and and and and and and and and  and Reverse of the string: olleh

forum

Write a C program to reverse a given string without using any built-in functions.

Utpal Vishwas

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