Exercise 6.55

Write four functions that add, subtract, multiply and divide two int values. Store pointers to these values in your vector from the previous exercise.

Solution

int add(int x, int y)
{
    return x + y;
}

int subtract(int x, int y)
{
    return x - y;
}

int multiply(int x, int y)
{
    return x * y;
}

int divide(int x, int y)
{
    return x / y;
}

// declaration from previous exercise:
vector<int (*)(int, int)> vec;

vec.push_back(add);
vec.push_back(subtract);
vec.push_back(multiply);
vec.push_back(divide);