calculations with pointers

This is a discussion on calculations with pointers within the C Programming forums, part of the General Programming Boards category; hey all, so im making one that uses pointers to pass the answers of four calculations. im just missing something ...

  1. #1
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    calculations with pointers

    hey all, so im making one that uses pointers to pass the answers of four calculations. im just missing something here, i go to compile it and it freezes and closes the program. thanks for the help.

    Code:
    #include <stdio.h>
    #include <stdlib.h>
    
    void calculation(double, double, double *, double *, double *, float *);
    
    int main()
    {
        double num1, num2;
        
        double *sum, *sub, *prod;
        float *div;
        
        float div_answer = 0;
        double sum_answer = 0;
        double sub_answer = 0;
        double prod_answer = 0;
        
                         
                          *sum = sum_answer;
                          *sub = sub_answer;
                          *div = div_answer;
                          *prod = prod_answer;         
                          
        printf("Please enter two numbers:");
        scanf("%f %f",&num1, &num2);
        
        calculation (num1, num2, &sum_answer, &sub_answer, &prod_answer, &div_answer);
        
                          printf("%d + %d = %d\n", num1, num2, sum_answer);
                          printf("%d - %d = %d\n", num1, num2, sub_answer);                      
                          printf("%d * %d = %d\n", num1, num2, prod_answer);    
                          printf("%d / %d = %f\n", num1, num2, div_answer);
        
        system("PAUSE");
      return 0;
    }
    
     void calculation (double num1, double num2, double *sum, double *sub, double *prod, float *div)
          {           
                      
                      *sum = num1 + num2;
                      
                      *sub = num1 - num2;
                     
                      *prod = num1 * num2;
                  
                      *div = num1 / num2;
                     
                      }

  2. #2
    Captain Crash brewbuck's Avatar
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    Quote Originally Posted by mackieinva View Post
    Code:
                          *sum = sum_answer;
                          *sub = sub_answer;
                          *div = div_answer;
                          *prod = prod_answer;
    This is the problem. You are assigning values to random spots in memory, since the four pointers on the left-hand-side are all uninitialized. This entire block of code, as well as the sum, sub, div, and prod pointers, are all unnecessary. Just take it out.

  3. #3
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    ty for the help brewbuck, it helped make it click. i wasnt trying to be an ass myself calling you a dick before just hard to tell sarcasm and things like that over the internet. later.

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