C program for "If a five digit number is input through the keyboard, write a program to print a new number by adding one to each of its digits. For example, if the number that is input is 12391, then the output should be displayed as 23502."

Problem: C program for "If a five digit number is input through the keyboard, write a program to print a new number by adding one to each of its digits. For example, if the number that is input is 12391, then the output should be displayed as 23502."

Logic used :

• Check if the number is not equal to zero
• Take remainder out using modulus with 10 and store it in a variable
• Increase remainder variable by 1
• Use formulae : output = ( output x 10 ) + remainder
• Take quotient out by dividing it by 10 and store it in the num variable itself
• Repeat above steps until num value becomes zero
• Set num = 0
• check if output is not equal to zero
• Take remainder out from output using modulus operator with 10
• Use formulae : num = ( num x 10 ) + remainder
• Take the quotient out from output by dividing it by 10 and store in output variable itself
• Repeat above steps after num = 0, until output becomes zero
• Print the num

Demo :

while(num!=0){

        remainder = num%10;

        remainder++;

        output=(output*10)+remainder;

        num = num/10;

    }

    num = 0;

while(output!=0){

        remainder = output%10;

        num=(num*10)+remainder;

        output = output/10;

    }

C program :

// Program by Shyam Kanth

#include<stdio.h>

int main(){

    int num, output=0, remainder;

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

    scanf("%d", &num);

    while(num!=0){

        remainder = num%10;

        remainder++;

        output=(output*10)+remainder;

        num = num/10;

    }

    num = 0;

    while(output!=0){

        remainder = output%10;

        num=(num*10)+remainder;

        output = output/10;

    }

    printf("Increased number is %d.",num);

    return 0;

}

Codes used :

• #include < stdio.h > : Header file for input-output
• int : Integer data type
• num, output, remainder : Variable used
• printf : Function used for displaying message
• scanf : Function used for taking input
• while : Loop
• != : Not equal to
• %d : Format specifier for integer type data

Do comments, if any doubt

Know about me : Shyam Kanth