Write a C program to reverse a string

Description: Take a word as input and print it in reverse order.

Hint:

• Use two variables for the first and last index. Swap the characters and move both towards the middle.

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C program to reverse a string

#include <stdio.h>
#include <string.h>

int main(void) {
    char s[50];

    printf("Enter a word: ");
    scanf("%49s", s);

    int left = 0, right = strlen(s) - 1;
    while (left < right) {
        char temp = s[left];
        s[left] = s[right];
        s[right] = temp;
        left++;
        right--;
    }
    printf("Reversed: %s\n", s);
    return 0;
}

Output:

How it works

• “Hello” has 5 characters. First ‘H’ and ‘o’ are swapped, then ‘e’ and ‘l’. The middle ‘l’ stays.
• The loop stops when left is not less than right.

Read Reverse a String in C.

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