下列程序的输出结果是________。#includeint main(void){ FILE *fp;int i, n = 0, k = 0;fp = fopen("source.txt", "w");for(i = 0; i < 5; i++)fprintf(fp, "%d", i);fclose(fp);fp = fopen("source.txt", "r");fscanf(fp, "%d%d", &n, &k);printf("%d,%d", n, k);fclose(fp);return 0;}