Thread: Need help starting a program with functions

So basically, one of my homeworks is to make a program that will ask arithmetic questions and some factoring questions to the user. The functions' purpose is to calculate how long it took the user to answer the questions and will return a certain number of points (Ill ask that question later on).

I just want to start the arithmetic questions for now.


So this is what I have so far:

Code:

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define ADD 1
#define MULT 2

//These are the pre-functions, given from the homework outline. 

double arithGAME (int max, int quantity, int op);
double factorGAME (int max, int quantity);
int numPoints ( double timesec);


int main () {
     
    int game;
    int choice, game_type;
    int max_value, max_numb, numb_prob;
    int max_questions;
    
    
    while (game != 4){
    
        printf("Please make a selection from the following:\n");
        printf("1.  Play Arithmetic Game.\n");
        printf("2.  Play Factoring Game.\n");
        printf("3.  Print Score.\n");
        printf("4.  Quit.\n");
  
//This is the part where the user will choose what type of game    
   
        scanf("%d", &game);

//This is Game 1, which is the arthimetic game

        if (game==1){
            printf("Would you like, 1)Addition or 2) Multiplication?\n");
            scanf("%d", &choice);
            
            if (choice==1)
                game_type= ADD;
            else
                game_type = MULT;
         printf("What is the maximum number you would like?\n");
         scanf("%d", max_numb);
         
         printf("How many problems do you want?\n");
         scanf("%d", max_questions);      
                
         arithGAME (max_numb, max_questions, game_type);
            
         }                 
//This is Game 2, which is the factoring game        
        else if (game==2){
             printf("Enter the maximum value of a factor");
             scanf("%d", &max_value);
             
             printf("How many factoring problems do you want?");
             scanf("%d", &numb_prob);
             
             factorGAME( max_value, numb_prob);
             
         }      

//This choice 3, which prints out the score
         else if (game==3){
              
         }
     }
    system("PAUSE");
    return 0;
    
}


//These are the Function's presets

//This the Arthicmetic function
double arithGAME (int max, int quantity, int op) {
      srand(time(0));
     
}


//This is the Factoring function
double factorGAME (int max, int quantity) {
      // srand(time(0));
}

Mainly, I need help setting up the questions.


I want the outline to start something like:

Please make a selection from the following:
1. Play Arithmetic Game.
2. Play Factoring Game.
3. Print Score.
4. Quit.
1


Would you like, 1)Addition or 2)Multiplication?
1
What is the maximum number you would like?
100
How many problems do you want?
4
What is 21+86?
107
Correct, great job!
What is 87+96?
173
Sorry, that's incorrect, the answer is 183.
What is 86+70?
156
Correct, great job!
What is 55+4?
59
Correct, great job!

So my question is, when setting up the questions, do I put in the main function, or separate function?

If it is in the main function, this is what I wrote, under Game 1:

Code:

         srand(time(0));
         numb_prob= 1 + max_questions;
         
               for(i=0; i<= numb_prob; i++){
                  
                  
               }

How would you differentiate from using Addition and Multiplication?

I'm sorry, but I'm not sure what I need to fix, based on what you've posted

So far, I've written this, under Game 1:

Code:

//This is Game 1, which is the arthimetic game

        if (game==1){
            printf("Would you like, 1)Addition or 2) Multiplication?\n");
            scanf("%d", &choice);
            
            if (choice==1)
                game_type= ADD;
            else
                game_type = MULT;
         printf("What is the maximum number you would like?\n");
         scanf("%d", &max_numb);
         
         printf("How many problems do you want?\n");
         scanf("%d", &max_questions);      
                
         arithGAME (max_numb, max_questions, game_type);
         
         srand(time(0));
         numb_prob= 1 + max_questions;
         
               for(i=0; i<= numb_prob; i++){
                        
                            if (game_type==ADD){
                                type_question_1 = 1 + rand()%max_numb; 
                                type_question_2 = 1 + rand()%max_numb; 
                                type_question_1 + type_question_2 = correct_ans;
                                
                            printf("What is %d + %d?\n", type_question_1, type_question_2);
                            scanf("%d", &user_ans);
                                   if (user_ans==correct_ans)
                                      printf("Correct, great job!\n");
                                   else 
                                      printf("Sorry, that's incorrect. The correct answer is %d\n", correct_ans);             
                             }
                  
               }
         
         
            
         }

However, the bolded line is saying that is "invalid Ivalue in assignment.

What I am doing wrong?

I was introduce to pointer on Friday, so I'm still confused about it, but thanks. Ill take a look at it again.

I fixed the latter problem and it works fine now

Code:

for(i=1; i<= max_questions; i++){
                        
                            if (game_type==ADD){
                                type_question_1 = 1 + rand()%max_numb; 
                                type_question_2 = 1 + rand()%max_numb; 
                                correct_ans= type_question_1 + type_question_2;
                                
                                 printf("What is %d + %d?\n", type_question_1, type_question_2);
                                 scanf("%d", &user_ans);
                                    if (user_ans==correct_ans)
                                       printf("Correct, great job!\n");
                                    else 
                                       printf("Sorry, that's incorrect. The correct answer is %d\n", correct_ans);             
                             }
                            else if (game_type==MULT){
                                type_question_1 = 1 + rand()%max_numb; 
                                type_question_2 = 1 + rand()%max_numb;
                                correct_ans= type_question_1 * type_question_2;
                                
                                printf("What is %d * %d?\n", type_question_1, type_question_2);
                                 scanf("%d", &user_ans);
                                    if (user_ans==correct_ans)
                                       printf("Correct, great job!\n");
                                    else 
                                       printf("Sorry, that's incorrect. The correct answer is %d\n", correct_ans);
                             }
               }

As for the function, it says that I need to return the number (in seconds) the user took to play the entier game, and then divide by the number of problems they solved (I have the scoring sheet to indicate how many points they earned, based on how long it took the user to answer).

How can I start a timing and end it while the user is answering the questions?

Timing can be done by using the include file time.h.

You'll want two variables of type "clock_t". I usually call them start and stop.

Code:

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

void endIt(clock_t start);

int main(void) {
  clock_t start;
  start = clock();    
  sleep(10);
  endIt(start);
  
  printf("\n\n\t\t\t     press enter when ready");
  start = getchar();
  return 0;
}
  
void endIt(clock_t start) {
  clock_t stop;
  float duration;
  stop = clock();
  duration = (stop - start)/CLOCKS_PER_SEC; 
  printf("\n\n Time required: %.2f seconds", duration);
}

The value "CLOCKS_PER_SEC;" may be different for your compiler. I've seen this as CLK_TCK, or TICKS_PER_SEC, on other compilers. It will be in the header file time.h, and should be mentioned in your help files.