#include <stdio.h>
int main() {
    FILE *fp;
    fp = fopen("iotext.txt", "w");
    if (fp == NULL) {
        printf("Error opening file\n");
        return 1;
    }
    fprintf(fp, "CS2263!\n");
    fclose(fp);
    fp = fopen("iotext.txt", "r");
    char c;
    do {
        c = getc(fp);
        putchar(c);
    } while (c != EOF);
    fclose(fp);
    return 0;
}