#include <stdio.h>
#define BUF_LEN 128

void task1() {
	puts("===== task1 =====");

	char infilepath[] = "files/text1.txt";
	FILE* fin = fopen(infilepath, "r");
	if (fin == NULL) {
		printf("Cannot open file %s\n", infilepath);
		return;
	}

	char outfilepath[] = "files/out1.txt";
	FILE* fout = fopen(outfilepath, "w");
	if (fin == NULL) {
		printf("Cannot open file %s\n", outfilepath);
		return;
	}

	char buf[BUF_LEN];
	while (fgets(buf, BUF_LEN, fin) != NULL) {
		for (int i = 0; buf[i] != '\0'; i++) {
			if (buf[i] == '\t') {
				buf[i] = '%';
			}
		}
		fprintf(fout, "%s", buf);
		printf(">>%s<<", buf);
	}
	fclose(fin);
	fclose(fout);
}

int main() {

	task1();



	return 0;
}