linux下GCC编译

 linux 下编译一个cpp程序

 1 #include “iostream”
 2 #include “iomanip”
 3 using namespace std;
 4 
 5 int main(int argc, char *argv[])
 6 {
 7 int a = 0, b = 0;
 8 
 9     //cout << "hello, world"<<endl;
10     //cin >> a >> b;
11     cout << 3.123456789 << "a=" << a << "   b=" << b << endl << endl;
12     cout << setprecision(9) << 3.123456789 << endl<<endl;
13     cout << setiosflags(ios::fixed) << 0.123456789 << endl;
14     cout << setw(10) << 2000 <<setw(10) <<12 << endl;
15     cout << setw(10) << 2 << setw(10) << 12345 << endl;
16     
17     return(0);
18 } 

执行

g++ my_code.cpp -o my_code