复习变量定义cout输出第5课 cin输入99 888 789复习变量定义int a ;int b ;a = 3;int c = 10;//等效于: int c ; c = 10 ;cout输出int pi = 3;cout << pi << endl;第5课 cin输入#include <iostream>using namespace std;int main(){ return 0;}99 888 789