example2_math_ops.cpp

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// math_operations.cpp
#include "math_operations.h"

int add(int a, int b) {
    return a + b;
}

int subtract(int a, int b) {
    return a - b;
}

// main.cpp
#include <iostream>
#include "math_operations.h"

int main() {
    std::cout << "5 + 3 = " << add(5, 3) << std::endl;
    std::cout << "5 - 3 = " << subtract(5, 3) << std::endl;
    return 0;
}