C - Exercise 5

In this exercise section of the tutorial we will write some C program.

Write a program in C to take 5 integer values from user and print the average

For this we will create a 1D array lets say, num of type int and size 5.

/**
 * file: avg-1d-array.c
 * author: yusuf shakeel
 * date: 2011-01-04
 * description: average program
 */

#include <stdio.h>
int main(void)
{
  //variable
  int num[5], i, sum;
  float avg;

  //user input
  printf("Enter 5 integer values: ");
  for (i = 0; i < 5; i++) {
    scanf("%d", &num[i]);
  }
  
  //compute average
  sum = 0;
  for (i = 0; i < 5; i++) {
    sum += num[i];
  }
  avg = (float) sum / 5;
  
  //output
  printf("Average: %f\n", avg);
  
  printf("End of code\n");
  return 0;
}

Output

Enter 5 integer values: 1 2 3 4 5
Average: 3.000000
End of code

Write a program in C to take integer marks (0-100) of 3 tests of 4 students and print the highest score of respective student

In the problem we will create a 2D array marks of type int having 4 rows for the four students and 3 columns for the three tests.

We will also create a 1D array maxMark of type int and size 4 to store the max mark of the 4 students.

/**
 * file: 1d-2d-array.c
 * author: yusuf shakeel
 * date: 2010-12-21
 * description: 1d 2d array and max score program
 */

#include <stdio.h>
int main(void)
{
  //variable
  int
    marks[4][3],
    maxMark[4],
    r, c;

  //user input
  for(r = 0; r < 4; r++) {
    printf("Enter marks of 3 tests of Student #%d: ", (r + 1));
    for(c = 0; c < 3; c++) {
      scanf("%d", &marks[r][c]);
    }
  }
  
  //find max mark
  for(r = 0; r < 4; r++) {
    maxMark[r] = 0;
    for(c = 0; c < 3; c++) {
      if (marks[r][c] > maxMark[r]) {
        maxMark[r] = marks[r][c];
      }
    }
  }
  
  //output
  printf("---------- Max Marks ----------\n");
  for(r = 0; r < 4; r++) {
    printf("Max mark of Student #%d is %d\n", (r + 1), maxMark[r]);
  }
  
  printf("End of code\n");
  return 0;
}

Output

Enter marks of 3 tests of Student #1: 80 90 50
Enter marks of 3 tests of Student #2: 60 70 80
Enter marks of 3 tests of Student #3: 50 80 60
Enter marks of 3 tests of Student #4: 90 70 50
---------- Max Marks ----------
Max mark of Student #1 is 90
Max mark of Student #2 is 80
Max mark of Student #3 is 80
Max mark of Student #4 is 90
End of code

Write a program in C to find the respective average marks of 3 students in 4 subjects

Given, marks are integer value between 0 to 100.
Marks of Student #1: 90 60 80 60
Marks of Student #2: 89 78 90 88
Marks of Student #3: 90 66 99 87

Try to write this program yourself.