C++/C conversion to just C

[Paul McKenzie]

okay i decided to take a different approach with globals instead of pointers.

Why?

The way you learn something is to write a small program instead of trying to shoehorn "learning" code into a larger, more complex program.

#include <stdio.h>

void ptrTest(int *p)
{
    *p = 20;
}

int main()
{
   int x = 10;
   printf( "The value of x = &#37;d\n", x );
   ptrTest( &x );
   printf( "The value of x = %d\n", x );
}

OK, so what don't you understand about the above program? Do you see that the value of x changes to 20?

That's why I pointed you to your own code with scanf() as a usage of pointers. Look at the call to ptrTest -- does it look familiar?

Also, global variables should be avoided.

It compiles, but the screen is black. Any input in this case?

Please format your code a little better than you have now.

int menu();
int addition(int reward); // function to return truth values
int subtraction(int reward);

int main()
{
    int Result, Finished = 0;
    int choice, score = 0;
    int reward = 0;

    while(Finished != 1); // while finished is not true
    {
        printf("\nscore: %d", score); // print the score
        {
            choice = menu(); // calls for user input and enters it to switch
            switch  (choice){ // accesses the functions
            case 0: Finished = 1;                     break;
            case 1: Result = addition(reward);           break;
            case 2: Result = subtraction(reward);        break;
            default : printf("Error in input\n\n");      break;
            }
            if(Result == 1){
                score += reward; // score = score + reward
            }
        }
    }
}

int menu() //main menu that gets called and allows fr user input
{
    int MenuChoice;
    printf("\n");
    printf("Enter 1 for addition\n");
    printf("Enter 2 for Subtraction\n");
    printf("Enter 0 to quit\n");
    printf("-----------------\n");
    printf("Choice: ");
    scanf("%d", &MenuChoice); // user input
    return MenuChoice; //return the choice to choice to select a case
}

int addition(int reward) //function that is called by the users selection
{
    int answer;
    int random1, random2;
    srand(time(NULL)); //generates fresh numbers each time.
    random1 = 1+(rand()%99); // from 1-99
    random2 = 1+(rand()%99); // from 1-99

    printf("\n%d - %d = ", random1, random2); //code to format the random math problem
    scanf("%d", &answer); // user input of answer
    {
        if (answer == (random1+random2)){
            printf("Congratulations\n\n");
            return reward = 1;// tellsesult whether to add a pt or not
        }   //if user is correct than the score is incremented
        else{
            printf("Incorrect\n\n");} //if not than the score is not incremented
        return 0;
    }
}

int subtraction(int reward) // follows same model as previous function, but instead subtraction.
{
    int answer;
    int random1, random2;

    srand(time(NULL));

    random1 = 1+(rand()%99); // from 1-99
    random2 = 1+(rand()%99); // from 1-99

    printf("\n%d - %d = ", random1, random2);
    scanf("%d", &answer);

    if (answer == (random1-random2)){
        printf("Congratulations\n\n");
        return reward = 1;// tells result whether to add a pt or not
    }
    else{
        printf("Incorrect\n\n");
    }
    return 0;
}

Also, are you using a debugger to debug your code?

Regards,

Paul McKenzie