C program for "If a five digit number is input through keyboard, write a program to reverse the number."

Problem:  C program for "If a five digit number is input through keyboard, write a program to reverse the number."

Logic used : 

• Start a loop
• check if the number is zero or not
• take the remainder out using modulus operator and store it in a variable
• take another variable with initial value zero . lets take it as ' rev '
• use the formulae : rev = rev x 10 + remainder
• take the quotient out by dividing number by 10 and store it in the num variable itself
• repeat whole step until the num variable becomes zero.

Demo :

while(num!=0){

        remainder = num%10;

        rev = rev*10+remainder;

        num=num/10;

    }

C program : 

// Program by Shyam Kanth

#include<stdio.h>

int main(){

    int num, rev, remainder;

    rev = 0;

    printf("Enter the five digit number : ");

    scanf("%d",&num);

    while(num!=0){

        remainder = num%10;

        rev = rev*10+remainder;

        num=num/10;

    }

    printf("Reversed number is %d.",rev);

}

Codes used : 

• #include < stdio.h > : Header file for input-output
• int : Integer data type
• num, rev, remainder : Variable used
• printf : Function for displaying message
• scanf : Function for taking input
• while : Loop

Do comment, if any doubt

Know about me : Shyam Kanth