Write a C program to reverse a number

Description: Take a number as input and print it in reverse order, like 1234 as 4321.

Hint:

• Take the last digit with % 10, add it to the reversed number, and remove it with / 10.

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C program to reverse a number

#include <stdio.h>

int main(void) {
    int n, reversed = 0;

    printf("Enter a number: ");
    scanf("%d", &n);

    while (n != 0) {
        int digit = n % 10;
        reversed = reversed * 10 + digit;
        n /= 10;
    }
    printf("Reversed number = %d\n", reversed);
    return 0;
}

Output:

How it works

• Round 1: digit 4, reversed = 4, n = 123.
• Round 2: digit 3, reversed = 43, n = 12.
• It continues until n is 0, and the answer is 4321.

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