C program to compute the sum of digits in a given numbers

C program to compute the sum of digits in a given numbers

In this tutorial, we will discuss a concept of  C program to compute the sum of digits in a given numbers

In C programming  language, we can use for loop ,while loop and do-while loop to compute the sum of digits in a given numbers

In this article, we are going to learn  how to find the sum of digits in a given number in C language

 

Compute the sum of digits using loops

Compute the sum of digits in a given numbers using for loop

Program 1

#include <stdio.h>
#include <stdlib.h>

int main()
{
    long num,count,digits,sum=0;
    printf("Enter a number\n");
    scanf("%ld",&num);

for(count=num; num>0; num/=10)
{
    digits=num%10;
    sum=sum+digits;

}
printf("Given number is: %ld\n",count);

printf("\nSum of the digits %ld is = %ld\n",count,sum);
getch();
    return 0;
}

When the above code is executed, it produces the following results

Csae 1

Enter a number for find digits sum
111100
Given number is:111100

Sum of the digits  111100 is = 4

 

Csae 2

Enter a number for find digits sum
12345
Given number is:12345

Sum of the digits  12345 is = 15

 

Compute the sum of digits in a given numbers using while loop

Program 2

#include <stdio.h>
#include <stdlib.h>

int main()
{
    long num,count,digits,sum=0;
    printf("Enter a number for find sum of digits\n");
    scanf("%ld",&num);

    count=num;;
while( num>0)
{
    digits=num%10;
    sum=sum+digits;
    num/=10;

}
printf("Given number is: %ld\n",count);

printf("\nSum of the digits %ld is = %ld\n",count,sum);
getch();
    return 0;
}

When the above code is executed, it produces the following results

Case 1

Enter a number for find sum of digits
1030
Given number is:1030

Sum of the digits  1030 is = 4

 

Case 2

Enter a number for find digits sum
56789
Given number is:56789

Sum of the digits  56789 is = 35

 

Compute the sum of digits in a given numbers using do while loop

Program 3

#include <stdio.h>
#include <stdlib.h>

int main()
{
    long num,count,digits,sum=0;
    printf("Enter the number for find sum of digits\n");
    scanf("%ld",&num);

    count=num;;

do{
    digits=num%10;
    sum=sum+digits;
    num/=10;

}while( num>0);
printf("Given number is: %ld\n",count);

printf("\nSum of the digits %ld is = %ld\n",count,sum);
getch();
    return 0;
}

When the above code is executed, it produces the following results

Case 1

Enter a number for find sum of digits
11111
Given number is:11111

Sum of the digits  11111 is = 5

 

Case 2

Enter a number for find digits sum
76543
Given number is:76543

Sum of the digits  76543 is = 25

 

Methods

• Declare the variable num,count and digits as long type.
• Declare and initialize variable sum to Zero.
• Receive input from the user for the value to find the sum of digits and to store the variable num.
• Using a loop (for loop , while loop, do-while loop) get each digit of the number and add it to the to a variable to find the sum.
• Display the sum of the digits of the number.

 

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