Thread: random number guessing game

So, yeah, I'm pretty new at C, and am in a beginner's class. Had to do this for an assignment, and was wondering if anyone could give me some pointers.

The instructions are:

Create a guessing game where the computer chooses a random number between 1 and 100. The user then tries to guess that number. The computer will tell the user whether the hidden number is higher or lower than the number that was guessed. When the correct number is guessed, report back how many guesses it took to find the correct number. Then offer to play the game again.

So far I have the following programmed:

Code:

/*
@author:
@date/version:20102405.01
@title:Guessing Game
*/

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(void)
{
    int stime;
    long ltime;
    int thisRandomNumber;
    int userinput;

    /* get the current time and then send the random number */
    ltime= time(NULL);
    stime= (unsigned) ltime/2;
    srand(stime);

    //calculate a random number between 1 and 100 */
      thisRandomNumber= rand() %100 + 1;

    printf("Guess the random computer generated number:\n");
    scanf("%d",&userinput);

    if (userinput == thisRandomNumber){
       printf("That's the number!\n");
    }
    else if (userinput > thisRandomNumber){
    printf("Your guess is higher than the number.\n");
    }
    else if(userinput < thisRandomNumber){
    printf("Your guess is lower than the number.\n");
    }

    return 0;

}

It will randomly compute a number, and it will tell if the number should be higher, lower, or correct, but after doing so, the program will end and will have to be executed again. How would I get it to continue letting the user guess that same number until the correct number is inputted?

There are a number of ways you could do this. One way would be to use a do/while loop. Have a look at these search results - you should be able to find some decent examples of how it works.

How about using a do while loop?

What should the test for the loop be?

Code:

do {


}while(??????????);

It's funny I just did this same program. The only difference is I added options for 1-100 1-50 and 1-20.

The do while loop is the way I went.

I wasn't too clear on do while loops before doing this, but I think I have a lot more of an understanding now. However, I keep on getting an error when I try to compile it...

guessinggame.c: In function âmainâ:
guessinggame.c:51: error: expected âwhileâ at end of input
guessinggame.c:51: error: expected declaration or statement at end of input

and here's my source code again:

Code:

  

/*
@author:
@date/version:20102405.01
@title:Guessing Game
*/

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(void)
{
    int stime;
    long ltime;
    int thisRandomNumber;
    int userinput;
    int userTries;

    /* get the current time and then send the random number */
    ltime= time(NULL);
    stime= (unsigned) ltime/2;
    srand(stime);

    //calculate a random number between 1 and 100 */
      thisRandomNumber= rand() %100 + 1;

 userTries=0;

    do{
    printf("Guess the random computer generated number:\n");
    scanf("%d",&userinput);

    if (userinput == thisRandomNumber){
       printf("That's the number!\n");
    }
    else if (userinput > thisRandomNumber){
    printf("Your guess is higher than the number.\n");
    }
    else if(userinput < thisRandomNumber){
    printf("Your guess is lower than the number.\n");

    userTries++;

    }while (thisRandomNumber!=userinput);

    printf("\nCongratulations! That is the number! It took you %d tries", userTries);


    return 0;

 }

You have a problem that you can't see easily, because you didn't indent your code correctly.
Do you have matching curly braces on the last else statement?

That's why indenting code correctly is SO worthwhile. You can spot problems like this, quickly.

Yeah, I discovered I was missing a "{". It seems to be running smoothe and working now.

Thanks for all the help!