Thread: Passing variable from an outside function to main?

This code is for a program that allows you to play a guessing game or arithmetic game and shows your total score from both as you go along. The program works fine the only problem I'm having is with the score. Is there a way to call the score value from the outside function into main?

Code:

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


//prototype functions
void menu();
int guessGame();  //A game to guess a number between 1 and 100
int arithgame(); //Taken out to make reading easier atm


//main function
int main () {
    int choice, total_score=0, score;
    //choice refers to menu selection


    printf("Welcome User!\n\n");
    //A simple welcome message for the user


     while (choice != 4) {
        menu();
        scanf("%d", &choice);


        if(choice == 1){


        }


        else if(choice == 2){
            guessGame();
        }


        else if(choice == 3){
            total_score = guessGame(&score);
            printf("Your score is %d.\n\n", total_score);
            //This is supposed to show the current score

        }
     }
    printf("Thank you for playing!");
    //Quit Statement


return 0;
}


int guessGame(){
    srand(time(0));
    //seeding random generator
    int num, guess, turn_count=0, score=0;
    //turn_count will count the number of guesses and turn that into the final score


    num = rand() % 100 + 1;


    printf("Guess a number between 1 and 100.\n");
    scanf("%d", &guess);
    turn_count++;


    while (guess != num) {
        if (guess > num){
        printf("Your guess is too high, try again:\n\n");
        scanf("%d", &guess);
        turn_count++;
        }


        else if (guess < num){
        printf("Your guess is too low, try again:\n\n");
        scanf("%d", &guess);
        turn_count++;
        }
    }
    printf("Great, you guessed the number %d in %d guesses!", num, turn_count);
    score= 17 - turn_count;


    return score;
}


int arithgame(){}
//again removed for reading purposes


//menu for convinient calling
void menu() {
    printf("\nPlease make a selection from the following:\n");
    printf("\t 1 - Play Arithmetic Game.\n");
    printf("\t 2 - Play Guessing Game.\n");
    printf("\t 3 - Print Score.\n");
    printf("\t 4 - Quit.\n");
    return;
}

So trying to pass the value of score from the outer function int guessGame() into the score print statement in choice 3 of the main function? Oh and the "17 -turn_count" was just part of the requirements of the assignment. Help is greatly appreciated.

Adding a parameter is certainly possible, but I think it's overkill here in that you already have the line

Code:

return score;

in your function which (surprisingly) returns the score to your main program (as desired). Your main program's task, then, is to not throw this value away (which is what you are currently doing). In your main program, the bit of code "guessgame()" has the value that the function returns -- you need to add this value to your total score.

Tabstop, I added in:

Code:

else if(choice == 2){
            total_score += guessGame();
        }

Is that what you meant? When I do this though, the score is incorrect. I set both score and total_score to equal zero in main too. Oh and choice 3 looks like this now:

Code:

else if(choice == 3){
            printf("Your score is %d.\n\n", total_score);
        }

Surely you don't still have the line

Code:

total_score = guessGame(&score);

in your code, do you? Not only is the function call bad (since you pass a parameter to a function that doesn't take one), but you are then forcing people to play the game when they only want to see the score, and then resetting the total_score to score of that one game.

Alright it's working now thank you so much for your help