Q:

# Adding of two numbers using minus (-) operator in C/C++

Given two numbers, and the task is to find their addition using the minus (-) operator.

As we have discusses in C/C++ arithmetic operators that plus (+) operator adds the numbers and minus (-) operator subtracts the numbers. But adding two numbers using minus (-) operator can also be done – It's a simple mathematical trick.

As we know that, minus and minus becomes plus. Thus, to add two numbers – we can subtract the negative of the second number from the first number.

first_number - (-second_number)

Example:

Input:
x = 10
y = 20

Operation:
result = x - (-y)

Output:
result = 30

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Program:

#include <iostream>
using namespace std;

int main()
{
int x = 10;
int y = 20;

// printing the numbers
cout << "x : " << x << endl;
cout << "y : " << y << endl;

// calculation
int result = x - (-y);

// printing the result
cout << "result : " << result << endl;
cout << endl;

// assigning the other values
x = -10;
y = 20;

// printing the numbers
cout << "x : " << x << endl;
cout << "y : " << y << endl;

// calculation
result = x - (-y);

// printing the result
cout << "result : " << result << endl;
cout << endl;

// assigning the other values
x = -10;
y = -20;

// printing the numbers
cout << "x : " << x << endl;
cout << "y : " << y << endl;

// calculation
result = x - (-y);

// printing the result
cout << "result : " << result << endl;

return 0;
}

Output:

x : 10
y : 20
result : 30

x : -10
y : 20
result : 10

x : -10
y : -20
result : -30

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