i was working on an educationary project to study C where specific labels include code to that specific topic being studied. However, at the end of each code block i want the compiler to ask if the user wants to exit or countine from beginning:

        void main(void)
    {
        beginning:
        printf("goto : \n 1) pointers \n 2) classes \n 3) \n 4) \n 5) \n ");
        scanf_s("%d", &input);
            switch (input)
            {
            case 1:
                goto pointers;
            case 2:
                goto classes;
            case 3:
                case 4:
                    case 5:
            default:
                printf("wrong try again \n"); 
                goto beginning;
            }
    pointers:
    .....
    classes:
    ......
}

the code to check what the user wants:

    do {
        printf("1 for exit and 2 for return menu \n");
        scanf_s("%d", &reserved);
        if (reserved == 2) { goto beginning; }
        else if (reserved == 1) { exit; }
        else { printf("wrong number, put a valid one you little..!"); }
    } while (reserved != 1 && reserved != 2);

i tried to turn it to a function but the problem is labels are defined putside of main function so i want to just make the compiler put my function once it is called and not evaulate it from the beginning.

CodePudding user response：

The proper way to structure the code would be (pseudocode follows):

Do
  PrintPrompt()
  input = ReadInput()
  switch (input) 
    case 1: DoFirstThing()
    case 2: DoSecondThing()
    ...
    default: PrintError()
While (UserWantsToContinue())

There's really no justification to using goto here (or almost anywhere, see answers to this question). For the canonical thesis go here.