Thread: Double precision number help

I am new to C Programming and have been doing well so far. I am currently hitting a snag with "double" ie. double precision numbers. The code below is currently working correctly with int integer inputs and I'm trying to get it to instead take in double precision ones and still compile correctly. Help would be great

Code:

#include <stdio.h>


int main ()
{
    #define Maxgrade 3
    int grade [Maxgrade];
    int average, total;
    int i;
    
    
    total=0.0;
    
    for (i=0; i<Maxgrade; i++){
        printf ("Enter a grade:  ");
        scanf ("%d", &grade[i]);
        }
        
    for (i=0; i<Maxgrade; i++)
    {
        total += grade[i];
          }
    printf ("\nThe total is %d\n", total);
    
    average = total/3;
    
    printf ("\nThe average is %d\n\n\n", average);
        
    for (i=0; i<Maxgrade; i++){    
       if (grade[i]<average)
       printf ("*");
       
       if (grade[i]>=90)
       printf ("%d, A\n", grade[i]);
    
       else if (grade[i]<90, grade[i]>=80)
       printf ("%d, B\n", grade[i]);
    
       else if (grade[i]<80, grade[i]>=70)
       printf ("%d, C\n", grade[i]);
    
       else if (grade[i]<70, grade[i]>=60)
       printf ("%d, D\n", grade[i]);
    
       else if (grade[i]<60)
       printf ("%d, F\n", grade[i]);
        }
        
    system ("PAUSE");
    return 0;
    
}

To input a double use "%lf"; to print a double use "%f"

Code:

/* ... */
double grade[MAXGRADE]; /* Use ALLCAPS for define'd constants */
/* ... */
scanf("%lf", &grade[i]);
/* ... */
printf("%f", grade[i]);
/* ... */

Originally Posted by qny

To input a double use "%lf"; to print a double use "%f"

Code:

/* ... */
double grade[MAXGRADE]; /* Use ALLCAPS for define'd constants */
/* ... */
scanf("%lf", &grade[i]);
/* ... */
printf("%f", grade[i]);
/* ... */

Thanks a ton, it was the "%lf" scanf that was holding me up