/* Module: statistics.c

Author: Yana

Date: YEAR/MONTH/DAY

This program reads the grade of each student in class

of num_stud students and computes the following statistics:

1.The number of students that failed ( grade < 60)

2.The average grade of class

3.The average grade of passing students

Input: The number of students num_stud following by num_stud grades

Output: The number of students that failed, the average grade of class and

and average grade of passing students following by described message.

Algorithm: Read grades while maintaining the number of failures,

the sum of grades and the sum of grades of passing students

Assumption on input: input contains at least one grade. The grades are integers. */

#include < stdio.h >

int main(){

int num_stud = 0;                         /* The number of students in the class */
double average = 0.0;                       /* The average grade */
int num_fail = 0;                        /* The number of students that failed */
double pass_average = 0.0;                  /* The average grade of passing students */
int grade = 0;                             /* grade of current student */
int i = 1;                                 /* serial number of student */
int sum = 0;                      /* sum of student's grades */
int sum_pass = 0;                       /* sum of student's passing grades */
int num_pass = 0;                      /* number of students that passed */

/* input number of students */
printf ("Pelase, enter the number if students in your class ");
scanf ("%d", &num_stud);

/* Read grades and compute statistics */
while ( i <= num_stud) {
printf("Please enter grade of student%d ", i);
scanf("%d", &grade);

if (grade < 60)
num_fail = num_fail + 1;
else

sum_pass = sum_pass + grade;      /*update the sum of passing grades */

sum = sum + grade;       /* update the total sum of all grades */
i++;
}
num_pass = num_stud - num_fail;
average = (double)sum / num_stud;

if (num_pass > 0)

pass_average = (double)sum_pass / num_pass;

/* output results */
printf ("in class of %n students the total average is %f, ", num_stud, average);
printf ("the number of students passed is %d, their average is %f, ", num_pass, pass_average);
printf ("the number of students failed is %d ", num_fail);

}