C Program to reverse string

Simple C program to reverse string: In the given example, we swap string elements like first element with last element, second element with second last element and so on. We do this n/2 times or half of array size.

/* C Program to reverse string */
#include<stdio.h>
#include<string.h>
int main()
{
 char str[20];
 int i,j,n;
 printf("Enter a string: ");
 gets(str);
 n=strlen(str);
 for(i=0;i<n/2;i++)
 {
  char temp=str[i];
  str[i]=str[n-1-i];
  str[n-1-i]=temp;
 }
 printf("Reverse string is : %s",str);
 return 0;
}
/* End of program */

Another C Program to reverse string using pointer

/* C Program to reverse strin */
#include<stdio.h>
#include<string.h>
int main()
{
 char str[20];
 char *temp=str;
 printf("Enter a string: ");
 gets(str);
 while(*temp!='\0')
 {
  temp++;
 }
 temp--;
 printf("Reverse String is: ");
 while(temp>=str)
 {
  printf("%c",*temp);
  temp--;
 }
 return 0;
}
/* End of program */