Objective-C:如何在 switch 语句完成后返回到应用程序的开头

Question

例如，

在你的程序中你有:

NSLog(@"Where are you going?");
NSLog(@" 1 = Location1, 2 = Location2");

printf("Make a selection:");

scanf("%i, &value);

switch (value) {
    case 1:
        NSLog(@"You are going to Location 1.")
        break;

    case 2:
        NSLog(@"You are going to Location 2.");
        break;

    default:
        NSLog(@"That is not a valid location");
        break;
}

---

通常在您输入整数后，您的程序将返回 0 并且应用程序结束。你如何让它“循环”回到原来的 printf 来做出新的选择。或者甚至更好，一个新的 printf IE 'printf("Where else would you like to go?:");'?

Answer 1

你为什么不把它作为一个单独的方法，当你想循环的时候从它自己调用它。只需考虑以下代码，

void takeMeToPlaces() {

    NSLog(@"Where are you going?");
    NSLog(@"0 = Exit, 1 = Location1, 2 = Location2");

    printf("Make a selection:");

    scanf("%i, &value);

    switch (value) {
        case 0:
            NSLog(@"You don't like to go anywhere");
            break;

        case 1:
            NSLog(@"You are going to Location 1.");
            takeMeToPlaces();
            break;

        case 2:
            NSLog(@"You are going to Location 2.");
            takeMeToPlaces();
            break;

        default:
            NSLog(@"That is not a valid location");
            takeMeToPlaces();
            break;
    }
}