Hello World

mkdir temp
cd temp

1)C程序

gedit testc.c

#include<stdio.h>
int main()
{
printf("Hello World!\n");
return 0;
}

gcc testc.c -o hello
./hello

Hello World!

2）C++程序

gedit test.cpp

#include<iostream>
int main(){
std::cout<<"Hello, world!\n";
}

g++ test.cpp -o test
./test

Hello, world!