Question

我正在尝试创建一个重复结构，以便在代码末尾键入“Y”时再次重新运行“保险价格检查”。

#include <iostream>
using namespace std;

int main() {

    // Declaration of variables
    char animal, status, continue_;
    int i=0;

    //Begin Loop
    cout<<"Welcome to the Animal Insurance Company! What type of animal would you like to insure today: Enter D for Dog, C for Cat, B for Bird or R for Reptile: "<<endl;
    cin>>animal;

    if(animal=='D' || animal=='d') {
    cout<<"You have selected a dog, has your dog been neutered? Enter Y for Yes or N for NO."<<endl;
    cin>>status;
    if(status=='Y' || status=='y')
    cout<<"The insurance for your dog cost is $50."<<endl;
    else if(status =='N' || status=='n')
    cout<<"The insurance for your dog cost is $80."<<endl;
    else
    cout<<"Invalid Input, please type Y or N"<<endl;
}

else if (animal=='C' || animal=='c') {
    cout<<"You have selected a cat, has your cat been neutered? Enter Y for Yes or N for NO."<<endl;
    cin>>status;
    if(status=='Y' || status=='y')
    cout<<"The insurance for your cat cost is $40."<<endl;
    else if(status =='N' || status=='n')
    cout<<"The insurance for your cat cost is $60."<<endl;
    else
    cout<<"Invalid Input, please type Y or N"<<endl;
}

else if (animal=='B' || animal=='b' || animal=='R' || animal=='r')
cout<<"The insurance cost will be $10"<<endl;
else
cout<<"Invalid Input"<<endl;

cout<<"Do you want to insure another animal? Enter Y for Yes or N for NO."<<endl;
cin>>continue_;
if(continue_=='n' || continue_=='N') 
cout<<"Thank you for using Animal Insurance Company"<<endl;


return 0;
}

如何让代码循环回到开头？

Answer 1

我建议您使用do while循环。 https://www.tutorialspoint.com/cplusplus/cpp_do_while_loop.htm

do
{
// begin loop
...

}while(continue_!='n' && continue_!='N');

Answer 2

对于初学者来说，你需要一个循环......

在这个例子中，可能是一个while循环（如果你有兴趣查找它，请进行预测试）

要实现你想要的，你需要一个布尔标志，并且只要标志设置为true就会运行循环。

（假设你的其余代码工作正常）

// Declaration of variables
char animal, status, continue_;
int i=0;
bool running = true;  



//Begin Loop
while (running == true) {

    // Rest of program

    cout<<"Do you want to insure another animal? Enter Y for Yes or N for NO."<<endl;
    cin>>continue_;
    if(continue_=='n' || continue_=='N') {
        cout<<"Thank you for using Animal Insurance Company"<<endl;
        running = false;
    }
}
return 0;
}

Answer 3

B中。沃德是对的，你必须使用＆＃34;嵌套＆＃34; do-while循环以完全解决您的问题。因为在程序可以继续之前，代码中还有其他条件需要满足，并且它们还需要do-while循环的服务。像这样;

#include <iostream>

using namespace std;

int main() {

    // Declaration of variables
    char animal, status, continue_;
    int i=0;

    //Begin Loop
    do {
        cout<<"Welcome to the Animal Insurance Company! What type of animal would you like to insure today: Enter D for Dog, C for Cat, B for Bird or R for Reptile: "<<endl;
        cin >> animal;
        if(animal=='D' || animal=='d') {
            cout<<"You have selected a dog, has your dog been neutered? Enter Y for Yes or N for NO."<<endl;

            //until the required input is entered, program will keep asking for it
            do {
                cin>>status;
                if(status=='Y' || status=='y') {
                    cout<<"The insurance for your dog cost is $50."<<endl;
                    break;
                }
                else if(status =='N' || status=='n') {
                    cout<<"The insurance for your dog cost is $80."<<endl;
                    break;
                }

                else {
                    cout<<"Invalid Input, please type Y or N"<<endl;
                }

            }while(status != 'y' || status != 'Y' || status != 'n' || status != 'N');

        }

        else if (animal=='C' || animal=='c') {
            cout<<"You have selected a cat, has your cat been neutered? Enter Y for Yes or N for NO."<<endl;

            //until the required input is entered, program will keep asking for it
            do {
                cin>>status;
                if(status=='Y' || status=='y') {
                    cout<<"The insurance for your dog cost is $40."<<endl;
                    break;
                }
                else if(status =='N' || status=='n') {
                    cout<<"The insurance for your dog cost is $60."<<endl;
                    break;
                }

                else {
                    cout<<"Invalid Input, please type Y or N"<<endl;
                }

            }while(status != 'y' || status != 'Y' || status != 'n' || status != 'N');

        }

        else if (animal=='B' || animal=='b' || animal=='R' || animal=='r')
            cout<<"The insurance cost will be $10"<<endl;
        else {
            cout<<"Invalid Input"<<endl;
            break;
        }

        cout<<"Do you want to insure another animal? Enter Y for Yes or N for NO."<<endl;
        cin>>continue_;
        if(continue_=='n' || continue_=='N')
            cout<<"Thank you for using Animal Insurance Company"<<endl;

    }while(continue_ == 'y' || continue_ == 'Y');

    return 0;
}

如何根据用户输入使程序循环回到开头？

3 个答案: