本文实例为大家分享了C++实现加减乘除计算器的具体代码，供大家参考，具体内容如下
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#include <iostream>#include <conio.h>#include <string>void main(){ char str[0xFF]; do { system("cls"); float a{}; float b{}; int count = 1; int isOperating = -1; bool isFirst = true; std::string text{ "按任意键重置，继续计算\n" }; std::cout << "------计算机------\n"; std::cout << "请输入加减乘除："; std::cin >> str; for (int i = strlen(str) - 1; i >= 0; i--) { float* num = isFirst ? &b : &a; switch (str[i]) { case '*': isOperating = 0; break; case '/': isOperating = 1; break; case '+': isOperating = 2; break; case '-': isOperating = 3; break; } if (!isFirst&&!isdigit(str[i])&& str[i]<=127&& str[i]>=0) { isOperating = 4; text = "暂只支持正整数加减乘除，不能输入中文,其他符号或运算符\n按任意键重新输入\n"; break; } if (isOperating != -1 && count != 1 && isFirst) { isFirst = false; count = 1; if (i == 0 || i == strlen(str) - 1) { isOperating = 4; break; } continue; } *num += ((int)str[i] - 48) * count; count *= 10; } switch (isOperating) { case 0: std::cout << "结果为:" << a * b << std::endl; break; case 1: if (a == 0) text = "除数不能为0\n按任意键重置，继续计算\n"; else std::cout << "结果为:" << a / b << std::endl; break; case 2: std::cout << "结果为:" << a + b << std::endl; break; case 3: std::cout << "结果为:" << a - b << std::endl; break; default: text = text == "按任意键重置，继续计算\n" ? "错误格式,按任意键重新输入\n" : text; } std::cout << text; _getch(); } while (true);} |
用string接受做太简单了，用char数组比较好玩
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#include<iostream>using namespace std;int main(){ double a,b; char op; cout << "enter a" << endl; cin >> a; cout << "enter operator" << endl; cin >> op; cout << "enter b" << endl; cin >> b; double result; if (op=='+') { result = a + b; } else if (op=='-') { result = a-b; } else if (op=='*') { result = a*b; } else if (op=='/'){ if (b==0){ cout << "cannot devided by 0\n"; return 0; } else{ result =a/b; } } else { cout << "invalid operator\n"; return 0； } cout << "result is " << result << endl; return 0;} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_19300307/article/details/109676705
