C program for "If a four digit number is input through the keyboard, write a program to obtain the sum of first and last digit of this number."

Problem:  C program for "If a four digit number is input through the keyboard, write a program to obtain the sum of first and last digit of this number."

Logic used :

• Divide the number by 1000 and store the result in 'first' variable
• Take remainder out using modulus operator by 10 and store result in 'last' variable
• Add both variable and store the result in another variable
• Print that variable

Demo : 

f=num/1000;

l=num%10;

sum = f+l;

C program : 

// Program by Shyam Kanth

#include<stdio.h>

int main(){

    int num, f,l,sum;

    printf("Enter the 4 digit number : ");

    scanf("%d",&num);

    f=num/1000;

    l=num%10;

    sum = f+l;

    printf("Sum of %d and %d is %d.",f,l,sum);

    return 0;

}

Codes used : 

• #include < stdio.h > : Header file for input output
• int : Integer data type
• num, f,l,sum : Variable used
• printf : Function used for displaying message
• scanf : Function used for taking input

Do comment, if any doubt

Know about me : Shyam Kanth