A text-file scores.txt contains the numeric grades of a certain section. The num
ID: 3576656 • Letter: A
Question
A text-file scores.txt contains the numeric grades of a certain section. The number of grades in the file is not known; but it cannot be more than 30. Write a C program that creates a double 1D array of size 30, it then passes this array as an output parameter to a function getGradeResults that uses an EOF sentinel-controlled loop to read the grades from the text-file into the passed array. The function also returns the count of the grades read and their average.
The main function then displays the returned average, the grades in the returned array, and the count of the number of grades above the average.
Sample scores.txt
50.0 60.0
40.0 30.5 70.0 80.0
65.5
25.0 55.0
20.0
Sample program runs:
50.0 60.0
40.0 30.5 70.0 80.0
65.5
25.0 55.0
20.0
Average 49.6 The grades are 50.0 60.0 40.0 30.5 70.0 80. 0 65.5 25.0 55.0 20.0 Number of grades above the average 6Explanation / Answer
#include<stdlib.h>
#include<stdio.h>
void getGradeResults(FILE *f1, double arr[], int *count_grades, double *average)
{
*count_grades = 0;
double sum = 0.0;
while(fscanf(f1, "%lf", &arr[*count_grades]) != EOF) //read file upto end and store the values into array
{
sum += arr[*count_grades];
*count_grades = *count_grades + 1;
}
//calculating average
*average = sum / (*count_grades);
}
int main()
{
double arr[30];
int i,count_grades,count_grades_above_average=0;
double average;
FILE *f1;
f1 = fopen("scores.txt","r");
getGradeResults(f1,arr,&count_grades,&average); //passing address of grade count and average
printf("Average = %.2f ",average);
printf(" The grades are:");
for(i = 0; i < count_grades; i++)
{
printf("%.1f ",arr[i]);
if(arr[i] > average)
count_grades_above_average++;
}
printf(" Number of grades above the average = %d ", count_grades_above_average);
return 0;
}
output is below
Average = 49.60
The grades are:50.0 60.0 40.0 30.5 70.0 80.0 65.5 25.0 55.0 20.0
Number of grades above the average = 6
Process returned 0 (0x0) execution time : 0.053 s
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