1.if与最近的else配对, else if后面用花括号
2.if语句
3.switch语句
4.生成随机数:
#include <iostream> #include<ctime> #include<cstdlib> using namespace std; int main() { srand(time(NULL)); int r; r=rand()%4; cout<<r; return 0; }
#include <iostream> #include<ctime> #include<cstdlib> using namespace std; int main() { srand(time(NULL)); int r; r=rand()%4; cout<<r; return 0; }