对编码非常陌生,所以请理解 ;)
我主要是尝试使用 while
循环和 if
语句制作一个计算器。
#include <iostream>
using namespace std;
int x = 1;
int number;
int total = 0;
int amt = 1;
int a;
int b;
int c;
int d;
string ans;
class OperateClass
我收到错误:'main' 声明中有两个或多个数据类型
请解释这是什么意思/如何修复它。
我还想知道是否需要为每个函数(加、减、乘和除)创建一个新对象
请帮忙!
int main()
{
cout << "Do you want to add, subtract, multiply or divide? I want to : " << endl;
cin >> ans;
if(ans == "add"){
OperateClass opOper;
opOper.add();
}else{
if(ans == "subtract"){
OperateClass opOper
opOper.subtract();
}
}else{
if(ans == "multiply"){
OperateClass opOper
opOper.multiply();
}
}else{
if(ans == "divide"){
OperateClass opOper
opOper.divide();
}
}
}
class OperateClass{
public:
int add(){
while(x <= 3){
cout << "Enter a number to use to add: " << endl;
cin >> a;
total = total + a;
x++;
amt++;
}
}
int subtract(){
while(x <= 3){
cout << "Enter a number to use to add: " << endl;
cin >> b;
total = total - b;
x++;
amt++;
}
}
int multiply(){
while(x <= 3){
cout << "Enter a number to use to add: " << endl;
cin >> c;
total = total * c;
x++;
amt++;
}
}
int divide(){
while(x <= 3){
cout << "Enter a number to use to add: " << endl;
cin >> d;
total = total / d;
x++;
amt++;
}
}
}
int print(){
cout << "Your total is: " << total << endl;
return 0;
}
最佳答案
该代码均无效。您以 class OperateClass
开始类定义,但永远不会结束它并直接运行到 main
。一个(简化的)类定义采用以下形式:
class [name] {
}; // semi-colon terminates definition
// so...
class OperateClass {
};
接下来,您声明 main
... 但它会导致 else
分支(?)。
int main()
{
cout << "Do you want to add, subtract, multiply or divide? I want to : " << endl;
cin >> ans;
if(ans == "add"){
OperateClass opOper;
opOper.add();
}else{ // what is this?
函数也必须通过它们的右大括号终止,即
int main() {
} // function is over!
现在看起来这些可能只是复制/粘贴错误。如果是这种情况,那么您可能只是忘记了类定义末尾的分号。
关于c++ - 错误 : two or more data types in declaration of main?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11515064/