C++中函数的调用
*************C++
topic: call functions
*************
Calling functins in a program is everywhere.
Beautiful design is really beautiful. It looks exquisite. It is none of this topic's business.
https://i-blog.csdnimg.cn/direct/caf23481bec946eab48aa3049b48a812.png
Come back to functions. As is mentioned before, the basic struction of function is
// basic structure of function
返回类型 函数名 （参数类型 参数名，参数类型 参数名，···）
{
函数体
}
So write a code as an example.
#include <iostream>
using namespace std;
int g_c;
void add(int a, int b)
{
g_c = a + b;
}
int main()
{
return 0;
} int g_c here is a global variable. In another void function, add function can be called.
case 1: call directly
just use the function name to call the function.
#include <iostream>
using namespace std;
int g_c;
void add(int a, int b)
{
g_c = a + b;
}
int main()
{
// 直接调用add函数
add(13, 38);
return 0;
}
case 2 : use undirectly result after calling the add function.
sometimes it may happen that the resultt after used delaying being called.
#include <iostream>
using namespace std;
int g_c;
void add(int a, int b)
{
g_c = a + b;
}
void checkResult()
{
// 检查 g_c 的值
cout << "Result: " << g_c << endl;
}
int main()
{
add(13, 38); // add 被调用，结果存入 g_c
checkResult(); // 检查 g_c 的值
return 0;
}
case 3 : to provude a g_c interface
#include <iostream>
using namespace std;
int g_c;
void add(int a, int b)
{
g_c = a + b;
}
void Plus()
{
add(13, 38); // 调用 add 函数
}
int get_g_c()
{
return g_c;
}
int main()
{
Plus(); // 通过 Plus 函数调用 add
int result = get_g_c(); // 通过 get_g_c 函数获取 g_c 的值
cout << "g_c = " << g_c << endl; // 输出 g_c 的值
printf("result = %d\n", result); // 输出 result 的值
return 0;
}
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