win7 下学习vscode

#include<stdio.h>
#include<math.h>

extern void addnumber(double a,double b); //在这里告诉编译器，这个函数是另外一个文件中的
extern void addnumberb(double &a,double &b);  //.cpp 文件中才能允许使用引用
int main()
{
    printf("helloworld\n");
    double a=exp(2);
 double b=exp(3);
    printf("a=%f;b=%f\n",a,b);
     addnumber(a,b);//传入的值

    addnumberb(a,b); //在这个函数中，传入a，b 的引用，即使址传递，所以，在这个函数内部发生的变化，也会随着函数执行结束带到主函数中
    return 0;
}

 

 

{
    "tasks": [
        {
           
           "type": "process",
            "label": "hello1",
            //"command": "C:\\Program Files\\mingw-w64\\x86_64-8.1.0-win32-seh-rt_v6-rev0\\mingw64\\bin\\gcc.exe",
           "command":"gcc",
            "args": [
                "-g",
                "${workspaceFolder}\\hello.cpp",  //这里要给出全路径位置
                "${workspaceFolder}\\func.cpp",
                  "-o",
                "hello.exe"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": "build",
            "detail": "调试器生成的任务。"
        },
        {
        "type": "shell",  // cppbuild 不可以
        "label": "command",
        "command": "dir",   //
       
             "options": {
            "cwd": "${fileDirname}"
        },
        "problemMatcher": [
            "$gcc"
        ],
        "group": "build",
        "detail": "调试器生成的任务。"
    },
    {
       // "type": "",
        "label": "hello",
        "dependsOn":[
            "hello1",
            "command"
        ],
        "dependsOrder": "sequence"

    },



       
    ],
    "version": "2.0.0"
}

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "gcc.exe - 生成和调试活动文件",
            "type": "cppdbg",
            "request": "launch",
            "program": "${workspaceFolder}\\hello.exe",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${fileDirname}",
            "environment": [],
            "externalConsole": true,
            "MIMode": "gdb",
            "miDebuggerPath": "C:\\Program Files\\mingw-w64\\x86_64-8.1.0-win32-seh-rt_v6-rev0\\mingw64\\bin\\gdb.exe",
            "setupCommands": [
                {
                    "description": "为 gdb 启用整齐打印",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ],
            "preLaunchTask": "hello"
        }
    ]
}

　　

#include<stdio.h>

extern void  addnumber(double a,double b)  //这里告诉编译器，这个函数可以被其他文件引用
{
    double c;
    c=a;
    a=b;
    b=c;
    
    printf("this is a extern func:%f+%f=%f\n",a,b,a+b);   
   
}

extern void  addnumberb(double &a,double &b)  //这里告诉编译器，这个函数可以被其他文件引用
{
     double c;
     c=a;
     a=b;
     b=c;
   
    printf("this is a extern func:%f+%f=%f\n",a,b,a+b);   
   
}