generate random char and convert it to uppercase

main.cpp

#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>
#include <math.h>
#include <ctype.h>

int number = 10, buff = 0;
char queue[10];
sem_t full_sem, empty_sem;

void insert(char e) {
    if (buff + 1 < number) {
        printf(", inserted char: %c", e);
        queue[buff++] = e;
    } else
        printf("\nfull");
}

void Delete(char *e) {
    if (buff > 0) {
        *e = toupper(queue[--buff]);
    } else
        printf("\nempty");
}

void *produce() {
    for (int i = 0; i < number; ++i) {
        sem_wait(&full_sem);
        printf("\ninsert random char #%d", i);
        insert((char) 'a' + (random() % 26));
        sem_post(&empty_sem);
    }


}

void *consume(void *a) {

    for (int i = 0; i < number; ++i) {
        char v;
        sem_wait(&empty_sem);
        Delete(&v);
        printf("\nuppercase char: %c", v);
        sem_post(&full_sem);
    }


}

int main() {
    pthread_t t[2];
    sem_init(&full_sem, 0, number - 1);
    sem_init(&empty_sem, 0, 0);

    pthread_create(&t[0], NULL, &produce, NULL);
    pthread_create(&t[1], NULL, &consume, NULL);

    pthread_join(t[0], NULL);
    pthread_join(t[1], NULL);

    sem_destroy(&full_sem);
    sem_destroy(&empty_sem);
    return 0;
}

|SampleOutput.txt

insert random char #0, inserted char: n
insert random char #1, inserted char: w
insert random char #2, inserted char: l
insert random char #3, inserted char: r
insert random char #4, inserted char: b
insert random char #5, inserted char: b
insert random char #6, inserted char: m
insert random char #7, inserted char: q
insert random char #8, inserted char: b
uppercase char: B
uppercase char: Q
uppercase char: M
uppercase char: B
uppercase char: B
uppercase char: R
uppercase char: L
uppercase char: W
uppercase char: N
insert random char #9, inserted char: h
uppercase char: H