把1.cpp和2.cpp放到同一目录下，例如：
1.cpp 代码如下
#include <iostream>

int main()
{
	    void ChangeFunction(int* input, int n);
	    void PrintData(int* input, int n);

	    int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
	    PrintData(a, 10);
	
	    ChangeFunction(a, 10);
	    PrintData(a, 10);
	
	    return 0;
}
2.cpp代码如下
#include <iostream>

void ChangeFunction(int* input, int n)
{
	    for (int i = 0; i < n; i++)
	    {
		        input[i] += 10;
	    }
}

void PrintData(int* input, int n)
{
	    std::cout << "=============================" << std::endl;
	    for (int i = 0; i < n; i++)
	    {
		        std::cout << input[i] << " ";
	    }
	    std::cout << std::endl;
	    std::cout << "-----------------------------" << std::endl;
}
输出结果：
=============================
1     2    3    4    5    6    7    8    9   10
----------------------------------------------
=============================
11  12  13  14  15  16  17  18  19  20
----------------------------------------------

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

C++里面是有头文件的，标准的做法是：头文件里面放函数声明，cpp放函数具体实现。按照你的描述应该可以用一个.h头文件放全部函数的声明，然后在1.cpp里放一个函数，2.cpp里放另一个函数，我们把1.cpp作为程序的入口，作为数据源，在这里调用2.cpp里的函数，这个函数返回计算结果。注意，两个cpp都要includ头文件

C++一个项目里有两个CPP文件，想在一个CPP文件里调用另一个CPP文件的计算结果，怎么实现啊？