#include <stdio.h>

int subtraction(int num1, int num2) {
	int num2_inverted = ~num2;                       // invert num2 variable
	int twos_complement_of_num2 = num2_inverted + 1; // create variable of which
                                                         // value is twos complement of num2
	return twos_complement_of_num2 + num1;           // add twos complement of num2 and num1
}

int main() {
	printf("%d", subtraction(10, 5));                // print 10 - 5
	return 0;
}