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home / developersection / forums / write a c program to reverse a given string without using any built-in functions.
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Write a C program to reverse a given string without using any built-in functions.

Utpal Vishwas 974 21 Apr 2023

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

C Language programs
Updated 24 Apr 2023
Utpal Vishwas
Utpal Vishwas

Student

I am Utpal Vishwas from Uttar Pradesh. Have completed my B. Tech. course from MNNIT campus Prayagraj in 2022. I have good knowledge of computer networking.

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2 Answers

Aryan Kumar
Aryan Kumar 24 Apr 2023
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#include <stdio.h>
#include <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 < len / 2; i++) {
       char temp = str[i];
       str[i] = str[len - i - 1];
       str[len - i - 1] = temp;
   }
}
Krishnapriya Rajeev
Krishnapriya Rajeev 21 Apr 2023
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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 <stdio.h>
#include <string.h>

int main(){
  char str[100], rev[100];
  int i, j, len;
 
  printf("Enter a string: ");
  scanf(“%s”, str);       // read string from user
 
  len = strlen(str);      // 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
            Reverse of the string: olleh
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