Fprintf not printing

Question

I've been trying to do file excercises in C but when I run programs from the professor or tutorials (which should work), the file always comes out blank. Is there a solution to this?

My computer is pretty old, but it can still run various programs, I don't undersand why it doesn't work with files

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/*program that prints on a file your shopping list*/
int main(int argc, char **argv)
{
    FILE *fp= fopen("Shopping list.txt", "w");
    int end= 0; //have you finished writing the articles
    char article[80];   //the article you want to buy
    int n;      //quantity

    while(!end){
        printf("What do you need to buy? ");
        fgets(article, 80, stdin);
        article[strlen(article)- 1]= '\0';
        fprintf(fp, "%s ", article);

        printf("How much of it? ");
        scanf("%d", &n);
        fprintf(fp, "%d\n", n);

        printf("Are you done? (1= Yes, 0= No) ");
        scanf("%d%*c", &end);
    }
    fclose(fp);
}

It should print out on the file (which is created and remains empty) your input. There is no error message

Answer 1

I've resolved the problem by simply specifying the absolute path in fopen