sem5-problem1

#include <stdio.h>

#define MAX_FILENAME_LEN 100
#define MAX_STR_LEN 100

int main()
{
	char filename1[MAX_FILENAME_LEN],
			filename2[MAX_FILENAME_LEN],
			filename3[MAX_FILENAME_LEN];
	FILE *file1, *file2,*file3;

	printf("File name 1: ");
	scanf("%s", filename1);
	if ((file1 = fopen(filename1, "r")) == NULL)
	{
		printf("Can not open file: %s\n", filename1);
		return 1;
	}

	printf("File name 2: ");
	scanf("%s", filename2);
	if ((file2 = fopen(filename2, "r")) == NULL)
	{
		printf("Can not open file: %s\n", filename2);
		return 1;
	}

	printf("File name 3: ");
	scanf("%s", filename3);
	if ((file3 = fopen(filename3, "w")) == NULL)
	{
		printf("Can not open file: %s\n", filename3);
		return 1;
	}

	char s[MAX_STR_LEN];
	while (!feof(file1) || !feof(file2))
	{
		if (!feof(file1))
		{
			fscanf(file1, "%s\n", s);
			fprintf(file3, "%s\n", s);
		}
		if (!feof(file2))
		{
			fscanf(file2, "%s\n", s);
			fprintf(file3, "%s\n", s);
		}
	}

	fclose(file1);
	fclose(file2);
	fclose(file3);

	return 0;
}