// C code // This code will compute the values of the sales ticket sales for concerts // and sort the entries by those values // Developer: Faculty CMIS102 // Date: Jan 31, XXXX #include  #define MAXN 100 // max characters in a group/concert name #define MAXG 50 // max concerts/groups #define MAXC 3 // max categories char group [MAXG][MAXN]; int fans [MAXG][MAXC]; float prices [MAXC]; float sales [MAXG]; int count = 0; void printArray () { printf ("%15s%5s%5s%5s%10s ", "Concert", "s1", "s2", "s3", "Sales"); for (int i = 0; i < count; i++) { printf ("%15s", group [i]); for (int j = 0; j < MAXC; j++) { printf ("%5d", fans[i][j]); } // end for each category printf ("%10.2f ", sales [i]); } // end for each group } // end function printArray void computeSales () { for (int i = 0; i < count; i++) { sales [i] = 0; for (int j = 0; j < MAXC; j++) { sales [i] += prices [j] * fans [i][j]; } // end for each category } // end for each group } // end function computeSales void switchRows (int m, int n) { char tc; int ti; float v; // printf ("Switching %d with %d ", m, n); for (int i = 0; i < MAXN; i++) { tc = group [m][i]; group [m][i] = group [n][i]; group [n][i] = tc; } // end for each character in a group name for (int i = 0; i < MAXC; i++) { ti = fans [m][i]; fans [m][i] = fans [n][i]; fans [n][i] = ti; } // end for each fan category v = sales [m]; sales [m] = sales [n]; sales [n] = v; } // end switch int findMinSales (int m) { float min = sales [m]; int target = m; for (int i = m+1; i < count; i++) if (sales [i] < min) { min = sales [i]; target = i; } // end new max found return target; } // end function findMinSales void sortBySales () { int target; for (int i = 0; i < count; i++) { target = findMinSales (i); if (target > i) switchRows (i, target); } // for each concert } // end function sortBySales void getData () { // for (int i = 0; i < MAXG; i++) sales [i] = 0; printf ("Enter ticket prices in each of %d cateogories: ", MAXC); for (int i = 0; i < MAXC; i++) scanf ("%f", &prices [i]); printf ("-- Enter group and fans in %d categories ", MAXC); printf (" . to finish entries: "); for (int i = 0; i < MAXG; i++) { scanf ("%s", &group[i]); if (group [i][0] == '.') break; count++; for (int j = 0; j < MAXC; j++) scanf ("%d", &fans[i][j]); } // end for each group } // end function getData int main(void) { getData (); computeSales (); printArray (); printf (" --- Sorted --- "); sortBySales (); printArray (); printf("... bye ... "); return 0; } 

Enhance the program to allow the user to enter 4 categories. Explain the changes you made to the code, and create appropriate test data files and Modify the program to add a function to compute and display the total sales for all the concerts