How to jump to the beginning of the code? [closed]

问题

I am making a program that asks a user to put a input. If the user puts in the input it will show is input and then finish the program. How do I make the program start from the beginning? my code is built like this: (just showing the build not the code itself)

please enter user input:
while (x != y)
{ 
    if ( x == y )
    { 
        printf("printing something");
    }
    else if (x > y )
    {
        printf("printing something");
    }
    else
    {
        printf("printing something");
    }
}

回答1:

int main(void)
{
    int num = 0;
    while( 1 )
    {
        printf("This is a game to find the password. Start this game by trying to guess it with numbers from 1 - 100. The program will tell you if you are close or not.\n");

        num = 0; // reset the num back to zero
        while (num != 65)
        {
            printf("please enter a number:\n");
            num = GetInt();

            if (num == 65)
            {
                printf("Nice!!\n");
                break; // exit the while (num != 65)
            }
            else if (num > 50 && num < 60 )
            {
                printf("almost there! go higher!\n");

            }
        }
    }
}

回答2:

If you dont mind using goto:

HERE: please enter user input:
while (x!= y)
{ 
    if ( x == y )
    { 
        printf("printing something");
    }
    else if (x > y )
    {
        printf("printing something");
    }
    else
    {
        printf("printing something");
    }
    goto HERE;
}

In this example however as you can see you you never break while. You have to use
goto carefully.

Edit:

The above code has a mistake. In order to get inside the while loop x!=y. But then
you check x==y which is always false. So:

HERE: please enter user input:  
while (true)
{ 
    if ( x == y )
    { 
        printf("printing something");
        break;
    }
    else if (x > y )
    {
        printf("printing something");
    }
    else
    {
        printf("printing something");
    }
    goto HERE;
}

Edit 2:

You have only ONE while loop

int num;

//your code here

HERE:
num = GetInt();
while(true)
{
   if (num == 65)
   {
       printf("Nice!!\n");
       break;
   }
   else if (num > 50 && num < 60 )

   }
   else if (something )
       something
   }
   .
   .
   .
   else{
       something
   }
   goto HERE;
}

valter

来源：https://stackoverflow.com/questions/21291323/how-to-jump-to-the-beginning-of-the-code

标签

loops

while-loop