Files_12.1

#include <stdio.h>

void main() {
	FILE* f1, * f2;
	f1 = fopen("f1.txt", "r");
	f2 = fopen("f2.txt", "w");
	int i = 0, j = 0, flag = 1, count = 0, p = 0, num = 0;
	char buf[50] = { '\0' }, c[1] = "", year[15] = { '\0' }, name[15] = { '\0' }, bufn[15] = { '\0' }, t[20] = { '\0' };

	printf("Choose action: N, K.\n");
	scanf_s("%c", &c);
	if (c[0] == 'N') {
		printf("Enter the name: ");
		scanf_s("%s", &name);
		for (i = 0; !feof(f1); i++) {
			fgets(buf, 40, f1);
			for (j = 0; buf[j] != '-'; j++) {
				bufn[j] = buf[j];
				p = j + 2;
			}
			count = 0;
			if (strlen(name) == strlen(bufn)) {
				for (j = 0; j < strlen(name); j++)
					if (name[j] == bufn[j])
						count++;
				if (count == strlen(name)) {
					while (buf[p] != '-')
						p++;
					p++;
					for (j = p; j < strlen(buf); j++)
						t[j - p] = buf[j];
					printf("The number is ");
					puts(t);
				}
			}
			for (j = 0; j < strlen(buf); j++)
				buf[j] = '\0';
			for (j = 0; j < strlen(bufn); j++)
				bufn[j] = '\0';
		}
	}
	else
	if (c[0] == 'K') {
		printf("Enter the year: ");
		scanf_s("%s", &year);
		for (i = 0; !feof(f1); i++) {
			fgets(buf, 40, f1);
			while (buf[p] != '-')
				p++;
			p++;
			for (j = p; buf[j] != '-'; j++)
				t[j - p] = buf[j];
			if (atoi(t) >= atoi(year))
				count++;
			for (j = 0; j < strlen(buf); j++)
				buf[j] = '\0';
			for (j = 0; j < strlen(t); j++)
				t[j] = '\0';
		}

		printf("There are %d telephone(-s).", count);
	}
}