0:#include <stdio.h>
0:#define BUF_LEN 128
0:
0:void task1() {
1:	puts("===== task1 =====");
0:
1:	char infilepath[] = "files/text1.txt";
1:	FILE* fin = fopen(infilepath, "r");
0:	if (fin == NULL) {
1:		printf("Cannot open file %s\n", infilepath);
1:		return;
0:	}
0:
1:	char outfilepath[] = "files/out1.txt";
1:	FILE* fout = fopen(outfilepath, "w");
0:	if (fin == NULL) {
1:		printf("Cannot open file %s\n", outfilepath);
1:		return;
0:	}
0:
1:	char buf[BUF_LEN];
0:	while (fgets(buf, BUF_LEN, fin) != NULL) {
2:		for (int i = 0; buf[i] != '\0'; i++) {
0:			if (buf[i] == '\t') {
1:				buf[i] = '%';
0:			}
0:		}
1:		fprintf(fout, "%s", buf);
1:		printf(">>%s<<", buf);
0:	}
1:	fclose(fin);
1:	fclose(fout);
0:}
0:
0:int main() {
0:
1:	task1();
0:
0:
0:
1:	return 0;
0:}