Question

C语言程序问题求解，编写一个简单的计算器，要求每次输入加号等之后重新显示界面。为什么每次for循环两次

#include<iostream>using namespace std;int main(){ char m; int a = 3, b = 4; for (m = 1; m != 0;) { cout << "\t\t|--------------------------------------|\n"; cout << "\t\t|\t +:加法 |\n"; cout << "\t\t|\t -:减法 |\n"; cout << "\t\t|\t *:乘法 |\n"; cout << "\t\t|\t /:除法 |\n"; cout << "\t\t|--------------------------------------|\n"; cout << "请输入运算符（+ - * /）:"; m = getchar(); switch (m) { case '+':cout << a + b<<endl; break; case '-':cout << a - b<<endl; break; case '*':cout << a*b <<endl; break; case '/':cout << a / b<<endl; break; case '\r':system("cls"); break; } } return 0;}

Answer 1

请注意红框处的修改：