vscode error: ‘for‘ loop initial declarations are only allowed in C99 mode解决方法

在tasks.json的args里加上-std=c99

{
    "version": "2.0.0",
    "tasks": [
        {
            "type": "shell",
            "label": "C/C++: g++.exe 生成活动文件",
            "command": "C:\mingw64\bin\g++.exe",
            "args": [
                "-std=c99",
                "-g",
                "${file}",
                "-o",
                "${fileDirname}\${fileBasenameNoExtension}.exe"
            ],
            "options": {
                "cwd": "C:\mingw64\bin"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": "build"
        },
        {
            "type": "cppbuild",
            "label": "C/C++: gcc.exe 生成活动文件",
            "command": "C:/Users/轩/Desktop/Dev-Cpp/MinGW64/bin/gcc.exe",
            "args": [
                "-fdiagnostics-color=always",
                "-g",
                "${file}",
                "-o",
                "${fileDirname}\${fileBasenameNoExtension}.exe"
            ],
            "options": {
                "cwd": "C:/Users/轩/Desktop/Dev-Cpp/MinGW64/bin"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "调试器生成的任务。"
        }
    ]
}