[C++][CMake][生成可执行文件][上]详细讲解

#include <>
#include ""

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

#include <>
#include ""

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

#include <>
#include ""

int multiply(int a, int b)
{
    return a*b;
}

#include <>
#include ""

double divide(int a, int b)
{
    return (double)a/b;
}

// 
#ifndef _HEAD_H
#define _HEAD_H

int add(int a, int b);
int subtract(int a, int b);
int multiply(int a, int b);
double divide(int a, int b);

#endif

#include <>
#include ""

int main()
{
    int a = 20;
    int b = 12;
    printf("a = %d, b = %d\n", a, b);
    printf("a + b = %d\n", add(a, b));
    printf("a - b = %d\n", subtract(a, b));
    printf("a * b = %d\n", multiply(a, b));
    printf("a / b = %f\n", divide(a, b));
    return 0;
}