Question

Write a C Program.

Given a 50 x 5 matrix, consisting of 5 quiz grades of 50 students, find and display the fourth quiz grade of the student who got 25 from the third quiz, if any.

Answer 1

Here is the C code for the above task. I allocated a random grade array between 0 and 50 to each student in each quiz for testing. You should use the original grade array instead of this.

#include <stdio.h>

#include <stdbool.h>

#include <stdlib.h>

int main() {

   int grades[50][5]; // grades array 50 x 5

   // randomly fill grades between 0 and 50

   int i, j;

   for(i = 0; i < 50; ++i) {

       for(j = 0; j < 5; ++j) {

           grades[i][j] = rand() % 51;

       }

   }

   // check for students who got 25 from the third quiz

   // and display the fourth quiz grade

  

   bool noStudent = true; // if no student got 25 in third quiz

   for(i = 0; i < 50; ++i) { // loop through each student

       if(grades[i][2] == 25) { // if third quiz grade is 25

           printf("Student #%d, Fourth quiz grade: %d\n", i + 1, grades[i][3]);

           noStudent = false;

       }

   }

   if(noStudent) { // if No student got 25 in third quiz

       printf("No student met the criteria!\n");

   }

   return 0;

}

Code Screenshot:

C main.c>... #include <stdio.h> 2 #include <stdbool.h> #include <stdlib.h> int main() { int grades [50][5]; // grades array 50 x 5 // randomly fill grades between 0 and 50 int i, j; for(i = 0; i < 50; ++i) { for(j = 0; j < 5; ++j) { grades[i][j] = rand() % 51; // check for students who got 25 from the third quiz // and display the fourth quiz grade bool noStudent = true; // if no student got 25 in third quiz for(i = 0; i < 50; ++i) { // loop through each studenti if(grades[i][2] == 25) { // if third quiz grade is 25, printf("Student #%d, Fourth quiz grade: %d\n", i + 1, grades[i][3]); noStudent = false; if(noStudent) { // if No student got 25 in third quiz printf("No student met the criteria!\n"); return 0; 32 }

Sample IO:

[unseen@x510unr]08:53 am_$ -/prog/ -> gcc main.c [unseen@x510unr]08:53 am_$ -/prog/ -> /a.out Student #23, Fourth quiz grade: 41, Student #41, Fourth quiz grade: 34 [unseen@x510unr]08:53 am_$ ~/prog/C