Practice Program






  • Program of Sum of digits

    • Solution: through while loop 
    void main()
{
    int n,a,sum=0;

    printf("Enter the  Number: ");
    scanf("%d",&n);


    while(n!=0)
    {
        a = n%10;//as modulo operator gives
                 //last digit of number
                //when we modulo number with 10.
        sum = sum+a;
        
        n = n/10;
             //when we divide a number with 10
             //then it removes the last digit from
            //the number
    }
printf("Sum of digits is %d",sum);

}

    Output1
    Enter the Number:321

    Sum of digits is 9.
    Output2
    Enter the Number:3421

    Sum of digits is 10
    Output3
    Enter the Number:456

    Sum of digits is 15




    Solution: from do-while loop 
    void main()
{
    int n,a,sum=0;

    printf("Enter the  Number: ");
    scanf("%d",&n);


    do
    {
        a = n%10;//as modulo operator gives
                 //last digit of number
                //when we modulo number with 10.
        sum = sum+a;
        
        n = n/10;
             //when we divide a number with 10
             //then it removes the last digit from
            //the number
    }while(n!=0);
printf("Sum of digits is %d",sum);

}





    defining a function 'count_digit_sum' which will return sum of digits. 
    int count_digit_sum(int n)
{
    int a,sum = 0;
     while(n!=0)
    {
        a = n%10;//as modulo operator gives
                 //last digit of number
                //when we modulo number with 10.
        sum = sum+a;

        n = n/10;
             //when we divide a number with 10
             //then it removes the last digit from
            //the number
    }

    return sum;
}

    Using above define function 'count_digit_sum': 
    void main()
{
    int n,result;

    printf("Enter the  Number: ");
    scanf("%d",&n);


    //calling function
    result = count_digit_sum(n);

printf("Sum of digits is %d",result);

}

    Output1
    Enter the Number:321

    Sum of digits is 9.

    Using above define function 'count_digit_sum': 
    void main()
{
    int n,result;

    printf("Enter the  Number: ");
    scanf("%d",&n);


    //calling function
    result = count_digit_sum(n);

printf("Sum of digits is %d",result);

}

    Output2
    Enter the Number:456

    Sum of digits is 15.

    Using above define function 'count_digit_sum': 
    void main()
{
    int n,result;

    printf("Enter the  Number: ");
    scanf("%d",&n);


    //calling function
    result = count_digit_sum(n);

printf("Sum of digits is %d",result);

}

    Output3
    Enter the Number:326

    Sum of digits is 11.