C Exercises: Compute the average value of the elements in a queue

C Queue: Exercise-8 with Solution

Write a C program to compute the average value of the elements in a queue.

Sample Solution:

C Code:

#include <stdio.h>

#define MAX_SIZE 100

int queue[MAX_SIZE];
int front = -1, back = -1;

// Function to insert an element into the queue
void enqueue(int item) {
    if (back == MAX_SIZE - 1) {
        printf("Error: Queue is full\n");
        return;
    }
    if (front == -1) {
        front = 0;
    }
    back++;
    queue[back] = item;
}

// Function to remove an element from a queue
int dequeue() {
    if (front == -1 || front > back) {
        printf("Error: Queue is empty\n");
        return -1;
    }
    int item = queue[front];
    front++;
    return item;
}

// Function to compute the average of elements in a queue
float average() {
    if (front == -1 || front > back) {
        printf("Error: Queue is empty\n");
        return -1.0;
    }
    float sum = 0;
    int count = 0;
    for (int i = front; i <= back; i++) {
        sum += queue[i];
        count++;
    }
    float result = sum/count;
    return result;
}
// Function to display the elements in the queue
void display() {
    printf("Queue elements are: ");
    for (int i = front; i <= back; i++) {
        printf("%d ", queue[i]);
    }
    printf("\n");
}
int main() {
    // Insert some elements into the queue.
    enqueue(1);
    enqueue(2);
    enqueue(3);
    enqueue(4);
    enqueue(5);
    // Display the elements in the queue.
    display();
    // Find the sum of the elements in the queue.
    float avg = average();
    printf("Average of the elements in the queue is: %f\n", avg);
    printf("\nRemove 2 elements from the said queue:\n");
    dequeue();
    dequeue();
    // Display the elements in the queue.
    display();
    avg = average();
    printf("Average of the elements in the queue is: %f\n", avg);
    printf("\nInsert 3 more elements:\n");
	enqueue(300);
    enqueue(427);
    enqueue(519);
    // Display the elements in the queue.
    display();
    avg = average();
    printf("Average of the elements in the queue is: %f\n", avg);
    return 0;;
}

Sample Output:

Queue elements are: 1 2 3 4 5 
Average of the elements in the queue is: 3.000000

Remove 2 elements from the said queue:
Queue elements are: 3 4 5 
Average of the elements in the queue is: 4.000000

Insert 3 more elements:
Queue elements are: 3 4 5 300 427 519 
Average of the elements in the queue is: 209.666672

Flowchart:

C Programming Code Editor:

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