mianArg.cpp 使用mian函数的参数 f0512.cpp

//===================================================//mianArg.cpp 使用mian函数的参数 f0512.cpp//by leo//6.02.2011//===================================================#include<iostream>#include<fstream>#include<sstream>using namespace std;//---------------------------------------------------int main(int argc, char** argv){//for(int a, int b; cin>>a>>b; cout<<a+b<<endl);/*//--------输入输出文件作为main参数---------------for(int i=0; i<argc; i++)cout<<argv[i]<<endl;if(argc !=3)cout<<"usage: redirect infile outfile"<<endl;else{ifstream in(argv[1]);ofstream out(argv[2]);if(in && out)out<<in.rdbuf();}*///-----------命令解析--------------------------string s(argv[1]);istringstream sin(s);int a, b; char c;sin>>a>>c>>b;switch(c){case'-':cout<<a-b<<endl; break;case'+':cout<<a+b<<endl; break;case'*':cout<<a*b<<endl; break;default:cout<<"error!!"<<endl;}return 0;}//===================================================