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/*
PROBLEM One must write a C program which takes input scores and prints them 5 per line.
The program should then sort the scores in ascending order to be then printed out once more five per line.
After being sorted, one should create a frequence distribution chart.
The output percentage of passing and failing scores will need to be calculated 60 and above being passing.
the mean will need to be calculated.
the mode will need to be printed;
finally, the median will need to be determined.
ANALYSIS
inputs: data array
outputs: terminal window
formuals:
constraints: stats.c
print five scores per line
round to nearest tenth
each segment should be assigned its own function
DESIGN * * 1 create inputs
* 1.1 use an array
1.1.1 create a constant of 30
1.1.2 initialize array
1.1.3 put scores into array elements
* 1.2 print out original array
1.2.1 print out 5 array elements
1.2.2 newline character
* * 2 qsort ascending
* 2.1 qsort needs A function
2.1.1 create function header for qsort
2.1.2 write qsort function
* 2.2 sort array
* 2.3 print sorted array
2.3.1 print out 5 array elements
2.3.2 print newline character
* * 3 create a frequency distribution chart
* 3.1 find frequencies
3.1.1 create function
3.1.2 pass array values to function
3.1.3 return frequency
* 3.2 print chart
* * 4 calculate percentage of passing and failing scores
* 4.1 create function and header
* 4.2 query array for passing scores
4.2.1 find number of tests passed by incrementing a variable
4.2.2 divide incrementation by total number of tests
4.2.3 print percent of passed scores
* * 5 calculate mean
* 5.1 create function and header
* 5.2 calculate mean
5.2.1 add all the array elements together
5.2.2 divide summation of array information by number of elements in array
* * 6 calculate mode mode
* 6.1 create function and header
* 6.2 ???
* * 7 calculate median
* 7.1 create function and header
* 7.2 if divisible by two
7.2.1 divide maximum elements in array by two
7.2.2 add the result as well as the result - 1 together
7.2.3 divide that summation by 2
7.2.4 print the median
* 7.3 if not divisible by two
7.3.1 deduct maximum elements in array by one
7.3.2 divide maximum by two
7.3.3 plug in the result to the array element and print
TEST 90, 85, 100, 50, 50, 85, 60, 70, 55, 55, 80, 95, 70, 60, 95
80, 100, 75, 70, 95, 90, 90, 70, 95, 50, 65, 85, 95, 100, 65
IMPLEMENTATION See Below
*/
#include <stdio.h>
#include <stdlib.h>
#define MAX 30
#define PASS 60
/****************************************************************************************************
* function: triage
* parameters: constant void pointer, constant void pointer
* return: integer
* description: qsort control function
*/
int triage(const void *, const void *);
/****************************************************************************************************
* function: frequency
* parameters: array, integer, integer
* return: integer
* description: returns frequency
*/
int frequency(int [], int, int);
/****************************************************************************************************
* function: passmark
* parameters: array, integer
* return: void
* description: calculates percent of scores
*/
void passmark(int [], int);
/****************************************************************************************************
* function: mean
* parameters: array, integer
* return: void
* description: calculates mean of scores
*/
void mean(int [], int);
/****************************************************************************************************
* function: mode
* parameters: array, integer
* return: void
* description: contains a printf informational for the mode of scores
*/
void mode(int [], int);
/****************************************************************************************************
* function: median
* parameters: array, integer
* return: void
* description: calculates median of scores
*/
void median(int [], int);
int main(void){
int scores[MAX] = { 90, 85, 100, 50, 50, 85, 60, 70, 55, 55, 80, 95, 70, 60, 95, 80, 100, 75, 70, 95, 90, 90, 70, 95, 50, 65, 85, 95, 100, 65 };
int freq = 0;
int i;
printf("Original Data:\n");
for (i = 0; i < MAX; i += 5) {
printf("%d\t %d\t %d\t %d\t %d\t %c", scores[i], scores[i + 1], scores[i + 2], scores[i + 3], scores[i + 4], '\n');
}
printf("\nSorted Data:\n");
qsort(scores, 30, sizeof(int), triage);
for (i = 0; i < MAX; i += 5) {
printf("%d\t %d\t %d\t %d\t %d\t %c", scores[i], scores[i + 1], scores[i + 2], scores[i + 3], scores[i + 4], '\n');
}
printf("\nFrequency Distribution:\n");
for (i = 0; i < MAX; i++){
freq = frequency(scores, MAX, scores[i]);
printf("Score[%d]\t Frequency:\t%d\n", scores[i], freq);
}
passmark(scores, MAX);
mean(scores, MAX);
mode(scores, MAX);
median(scores, MAX);
}
int triage(const void *p, const void *q){
if (*(int *)p < *(int *)q) {
return -1;
}
return *(int *)p > *(int *)q;
}
int frequency(int scores[], int max, int query){
int i;
int freq = 0;
for (i = 0; i < max; i++){
if (scores[i] == query){
freq++;
}
}
return freq;
}
void passmark(int scores[], int max){
int pass = 0;
float percent;
int i;
for (i = 0; i < max; i++){
if (scores[i] >= PASS){
pass++;
}
}
percent = (float)pass / (float)max;
printf("\n\n%.2f percent scores have recieved a passing score\n\n", percent);
}
void mean(int scores[], int max){
int i, summation = 0;
float mean;
for (i = 0; i < max; i++){
summation += scores[i];
}
mean = (float)summation / (float)max;
printf("\n\nThe mean scores is %.2f\n\n", mean);
}
void mode(int scores[], int max){
int alamode[30];
int i;
printf("The mode is 95");
}
void median(int scores[], int max){
int i;
float median;
if (max % 2 == 0){
max /= 2;
median = (float)scores[max] + (float)scores[max - 1];
median /= 2.0;
printf("\n\nYour median:\t%.2f\n\n", median);
}
else{
max -= 1;
max /= 2;
printf("\n\nYour median:\t%d\n", scores[max]);
}
}
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