C++中main函数参数

C++ main函数带参数声明为int main(int argc, char* argv[])。第一个参数代表参数个数，第二个参数代表参数字符串数组。

#include<iostream>

//compile, g++ test.cpp -o test
//running, ./test 1 2.0
int main(int argc, char* argv[]){
    // sizeof(argv) will return the pointer size instead of array size like array!
    std::cout<<sizeof(argv)/sizeof(argv[0])<<std::endl; // 1
    std::cout<<argc<<std::endl; // 3

    // print the origin strings
    // "C:\Users\25411\Desktop\test\test.exe" "1" "2.0"
    for(int i=0; i<argc; ++i){
        std::cout<<argv[i]<<" ";
    }
    std::cout<<std::endl;

    // convert strings to proper type atoi, ascii to int  
    // atof, ascii to float
    // atol, atoll
    std::cout<<argv[0]<<std::endl; // "C:\Users\25411\Desktop\test\test.exe"
    std::cout<<atoi(argv[1])<<" "<<atof(argv[2])<<std::endl; // 1 2
    return 0;
}

赏

感谢您的支持:)

支付宝

微信