read text and convert it to uppercase

main.cpp

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

char inputString[100],uppercaseString[100];
sem_t len;
void *reader() {
    printf("Enter first text:");
    scanf("%s", inputString);
    printf("\n %s", inputString);

    sem_post(&len);
}

void *writer() {
    sem_wait(&len);
    for (int i = 0; i<100; i++) {
        uppercaseString[i]=toupper(inputString[i]);
    }

    printf("\nUpper: %s", uppercaseString);
}
int main() {
    pthread_t tid1,tid2;
    pthread_create(&tid1, NULL, reader, NULL);
    pthread_create(&tid2, NULL, writer, NULL);
    pthread_join(tid1, NULL);
    pthread_join(tid1, NULL);
    return 0;
}

|SampleInput.txt

5eukuei

|SampleOutput.txt

Enter first text:
 5eukuei
Upper 5EUKUEI