Thread: Help with Program

my math quiz program compiles and runs but when I try to type in an answer it freezes...


Can anyone spot an error i'm not seeing?

Code:

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

int randomNumbers(){
  return rand()%100;
} 

int question(){
     int snum = 1 + randomNumbers()%4;  
     char sign; 
     switch(snum){
     case 1 :          
        sign = '+';
     break;
     case 2 :            
        sign = '-';
     break;
     case 3:             
        sign =  '*';
     break;
     case 4 :             
        sign = '/';
     default:
     break;
}

    int num1 = randomNumbers();
    int num2 = randomNumbers();
    int answer = 0;
    int guess = 0;
    int point = 0;
    
    switch (sign){
           case '+' :
               answer = num1 + num2;
               printf ("%d %c %d\n",num1,sign,num2);
               printf("%d",answer);
           break;
           case '-' :
                answer = num1 - num2;
                printf ("%d %c %d\n", num1,sign,num2);
           break;
           case '*' :
                answer = num1 * num2;
                printf ("%d %c %d\n", num1,sign,num2);
           break;
           case '/' :
                answer = num1 / num2;
                printf ("%d %c %d\n", num1,sign,num2);
           default: 
           break;
    }
    
    printf ("Answer :");
    scanf ("%d",guess);
        
    if (guess == answer){
       point = 1;
       printf("Correct");
       }
    return point;
}

int main(){

  int NumOfQue = 0;
  int choice = 0;
  char name[20];
  int score = 0;
  int i;  
  
  while(choice != 4){   
  printf("\nMenu");
  printf("\n1.Please Enter Your Name");
  printf("\n2.Enter the Number of Questions");
  printf("\n3.Take the Math Quiz");
  printf("\n4.Quit\n");
  scanf("%d",&choice);
  switch(choice){
  case 1 :
    printf("Please Enter Your Name: " );
    scanf("%s",name);               
    break;
  case 2 :
    printf("Please Enter the Number of Questions you want to take: ");
    scanf("%d",&NumOfQue);
    break;
  case 3 :
  for(i=0;i<NumOfQue;i++){
  printf("%d",question());  
  }                        
  printf ("%d",score);        
  default: break;
  }
 
};

    return 0;
}

scanf requires an address-of -- use &guess.

When you get some extra time you may want to look into the problems of scanf. It may be better to get a character string from the user and convert it to an integer afterwards.

Here's a link to read:
http://faq.cprogramming.com/cgi-bin/...&id=1043284385

Also, maybe search around on this forum. There are plenty of threads that discuss alternatives to scanf.