#include <stdio.h>

int main() {
    FILE* outfile;
    outfile=fopen("output.txt", "w");
    if (outfile==NULL) {
        printf("File output.txt kan niet aangemaakt worden.\n");
    } 
    else {
        int i;
        for (i=0; i<10; i++) {
            fprintf(outfile, "Het kwadraat van %d is %d.\n", i, i*i);
        }
        fclose(outfile);
        printf("File output.txt is aangemaakt.\n");
    }
    getchar();
    return 0;
}