Listing Scores in descending order, by using the selection sort

Hello. This is what in my .txt document.

Code:

---

Lab  1: 10
Lab  2: 18
Lab  3: 22
Lab  4: 19
Lab  5: 14
Lab  6: 16
Lab  7: 18
Lab  8: 18
Exam 1: 65
Exam 2: 42

---

I would like to list those number in descending order without changing which test it is:

Let say Lab 1 is 10 points. After listing it in descending order, it would still be Lab 1: 10.

The output would look like this for example:

Lab scores in sorted order:

22 19 18 18 18 16 14 10


How would I go about doing this?



My current code:

Code:

---

#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <ctype.h>
#define MAX 8


void main (void);
void function1 (void);
void function2 (void);

void main (void)
{
    function1();
}


void function1 (void)
{
    FILE *in;
    char var;
    float lab [];
    float test [];

    if (( in =  fopen ("grades.txt", "r")) == NULL)
    {
        printf ("Error Opening File");
        return;
    }
   
 
    while ((fscanf(in, "%c", &var)) != EOF)
    {
   
        printf ("%c", var);
        if (var == ':')
            fscanf (in, "%f %f %f %f %f %f %f %f %f %f", &lab[1], &lab[2], &lab[3], &lab[4], &lab[5], &lab[6], &lab[7], &lab[8], &test[1], &test[2])
    }
    printf ("\n");
}

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Start by writing an implementation of insertion sort.
Then for the sorting process whenever you determine that values are out of order, swap both the data in the lab and test arrays for whichever index you need to swap.