C strrev

 The strrev() function is a built-in function in C and is defined in string.h header file. The strrev() function is used to reverse the given string.

Syntax:

strrev(str); 

Example 

#include<stdio.h>
#include<string.h>
  
int main()
{
   char str[100];

   printf("\nEnter the String : ");
   gets(str);
  
   printf("The given string is =%s\n",str);
  
   printf("After reversing string is =%s",strrev(str));
  
   return 0;
} 

Output

Reverse String Without Using Library Function [ Strrev ]

 

#include<stdio.h>
#include<string.h>
 
int main() {
   char str[100], temp;
   int i, j = 0;
 
   printf("\nEnter the string :");
   gets(str);
 
   i = 0;
   j = strlen(str) - 1;
 
   while (i < j) {
      temp = str[i];
      str[i] = str[j];
      str[j] = temp;
      i++;
      j--;
   }
 
   printf("\nReverse string is :%s", str);
   return (0);
} 

or

#include <stdio.h>

#include <conio.h>

 

int main() 

{

 

char str1[50], reversed[50];

int a, b, cnt = 0;

 printf("\nEnter String:");

  gets(str1);

//original string

 

printf("\n The given string is %s", str1);

 

// loop to calculate the length of the string

while (str1[cnt] != '\0') {

  cnt++;

}

 

b = cnt - 1;

 

//assigning the value to characters of a new string

for (a = 0; a < cnt; a++) {

  reversed[a] = str1[b];

  b--;

}

 

printf("\n The reversed string is %s", reversed);

getch();

}

Output