contos 编译运行简单的 c++

yum install gcc-c++

#include <iostream>
using namespace std;
int  main(){
cout<<"hello world";
}

[root@localhost demo]# g++ -o test.cpp test
g++: error: test: No such file or directory
g++: fatal error: no input files

[root@localhost demo]# vim test.cpp 
[root@localhost demo]# g++ test.cpp -o test
[root@localhost demo]# ls
test  test.cpp
[root@localhost demo]# ./test 
hello world