我目前正在使用C ++上一堂课，由于某种原因，我遇到一些麻烦。
询问用户在商店中的购买总额，以及
根据以下规则计算折扣：
如果他们花费$ 50，请给他们10％的折扣
如果他们花费$ 75，折扣为15％
如果他们花费$ 100，折扣为25％
最后，如果他们花费250美元或更多，他们将获得40％的折扣。
显示他们的购买金额，减去折扣并显示结果。
这是我到目前为止编写的代码：
#include <iostream>
using namespace std;
int main() {
double amount,discount=0.0;
cout<<"Enter the total amount of your purchase: $";
cin>>amount;
cout<<endl;
if (amount<50)
cout<<"You do not recieve a discount"<<endl;
else if(amount<=50.0)
{
discount=0.1*amount;
cout<<"Discount: $"<<discount<<endl;
amount=amount*0.9;
cout<<"Total Amount: $"<<amount<<endl;
return 0;
}
else if(amount<=75.0)
{
discount=0.15*amount;
cout<<"Discount: $"<<discount<<endl;
amount=amount*0.85;
cout<<"Total Amount: $"<<amount<<endl;
return 0;
}
else if(amount<=100.0)
{
discount=0.25*amount;
cout<<"Discount: $"<<discount<<endl;
amount=amount*0.75;
cout<<"Total Amount: $"<<amount<<endl;
return 0;
}
else if(amount<=250.0)
{
discount=0.4*amount;
cout<<"Discount: $"<<discount<<endl;
amount=amount*0.6;
cout<<"Total Amount: $"<<amount<<endl;
return 0;
}
return 0;
}
我没有收到正确的数字，例如，如果我输入74，它将给我11.1
我觉得这是我输入错误号码的简单原因，但我不确定为什么
最佳答案
int main() {
double amount,discount=0.0;
cout<<"Enter the total amount of your purchase: $";
cin>>amount;
cout<<endl;
if (amount<50)
cout<<"You do not recieve a discount"<<endl;
else if(amount>=250.0)//250 or more
{
discount=0.4*amount;
cout<<"Discount: $"<<discount<<endl;
amount=amount*0.6;
cout<<"Total Amount: $"<<amount<<endl;
return 0;
}
else if(amount>=100.0)
{
discount=0.25*amount;
cout<<"Discount: $"<<discount<<endl;
amount=amount*0.75;
cout<<"Total Amount: $"<<amount<<endl;
return 0;
}
else if(amount>=75.0)
{
discount=0.15*amount;
cout<<"Discount: $"<<discount<<endl;
amount=amount*0.85;
cout<<"Total Amount: $"<<amount<<endl;
return 0;
}
else if(amount>=50.0)
{
discount=0.1*amount;
cout<<"Discount: $"<<discount<<endl;
amount=amount*0.9;
cout<<"Total Amount: $"<<amount<<endl;
return 0;
}
return 0;
}
关于c++ - C++ If语句逻辑，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/25984878/