sum_of_digits.cpp File Reference

A C++ Program to find the Sum of Digits of input integer. More...

#include <cassert>
#include <iostream>

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Functions
int	sum_of_digits (int num)
void	test1 ()
void	test2 ()
void	test ()
int	main ()

Detailed Description

A C++ Program to find the Sum of Digits of input integer.

Copyright 2020

Author

iamnambiar

Function Documentation

main()

int main

(

void

)

Main Function

           {
    test();
    std::cout << "Success." << std::endl;
    return 0;
}

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sum_of_digits()

int sum_of_digits

(

int

num

)

Function to find the sum of the digits of an integer.

Parameters

num	The integer.

Returns

Sum of the digits of the integer.

\detail First the algorithm check whether the num is negative or positive, if it is negative, then we neglect the negative sign. Next, the algorithm extract the last digit of num by dividing by 10 and extracting the remainder and this is added to the sum. The number is then divided by 10 to remove the last digit. This loop continues until num becomes 0.

                           {
    // If num is negative then negative sign is neglected.
    if (num < 0) {
        num = -1 * num;
    }
    int sum = 0;
    while (num > 0) {
        sum = sum + (num % 10);
        num = num / 10;
    }
    return sum;
}

test()

void test

(

)

Function for testing the sum_of_digits() with all the test cases.

            {
    // First test.
    test1();
    // Second test.
    test2();
}

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test1()

void test1

(

)

Function for testing the sum_of_digits() function with a first test case of 119765 and assert statement.

             {
    int test_case_1 = sum_of_digits(119765);
    assert(test_case_1 == 29);
}

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test2()

void test2

(

)

Function for testing the sum_of_digits() function with a second test case of -12256 and assert statement.

             {
    int test_case_2 = sum_of_digits(-12256);
    assert(test_case_2 == 16);
}

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