1	/*
     2	 * Read and evaluate student test scores
     3	 */
     4	#include <stdio.h>
     5	
     6	/* Display a notice regarding average test score
     7	   3 test scores are required as parameters */
     8	void GiveNotice (int score1, int score2, int score3)
     9	{
    10	    /* Are the scores all positive? */
    11	    if (score1 >= 0 && score2 >= 0 && score3 >= 0)
    12	    {
    13	       /* Compute average score */
    14	       double Average = (score1 + score2 + score3) / 3.0; 
    15	       printf ("Average score is %.1f -- ", Average );
    16	
    17	       /* Display a message depending on range the score falls in */
    18	       if (Average >= 60.0)
    19	       {
    20	          printf ("Passing");
    21	          if (Average < 70.0)
    22	          {
    23	              printf (" but marginal");
    24	          }
    25	          printf (".");
    26	       }
    27	       else
    28	       {
    29	          printf ("Failing.");
    30	      }
    31	    }
    32	    /* Display invalid data message */
    33	    else
    34	    {
    35	       printf ("Invalid data: score less than zero.");
    36	    }
    37	
    38	} 
    39	
    40	int main (void)
    41	{
    42	    int IDnum;    /* Student ID number */
    43	    int score1;   /* Score on first test */
    44	    int score2;   /* Score on second test */
    45	    int score3;   /* Score on third test */
    46	
    47	    /* Obtain input */
    48	    printf("Enter a Student ID number and three test scores: ");
    49	    scanf ("%d%d%d%d",&IDnum,&score1,&score2,&score3);
    50	
    51	    /* Echo the input data */
    52	    printf("Student number: %d \n", IDnum);
    53	    printf("Test Scores: %d %d %d \n",score1,score2,score3 );
    54	
    55	    /* Go do the calculations */
    56	    GiveNotice (score1, score2, score3);
    57	    return 0;
    58	}