#include <stdio.h>
#include <string.h>
 
int main() {
    char str[100], rev[100];
    char *ptr1, *ptr2;
    int length, i;
 
    // Input string
    printf("Enter a string: ");
    fgets(str, sizeof(str), stdin);
 
    // Remove newline character if present
    length = strlen(str);
    if (str[length - 1] == '\n') {
        str[length - 1] = '\0';
        length--;
    }
 
    // Set pointers
    ptr1 = str;             // Points to start of string
    ptr2 = rev + length - 1; // Points to end of reverse string
 
    // Null terminate reverse string
    rev[length] = '\0';
 
    // Copy characters in reverse order
    for (i = 0; i < length; i++) {
        *ptr2-- = *ptr1++;
    }
 
    // Display reversed string
    printf("Reversed string: %s\n", rev);
 
    return 0;
}