Concatenate two .y inputs - c

Question

I am having two inputs :video1.y and video2.y .I want to Concatenate these two files to create one video.y file ??I am writing code in C .It may be basic question but not able to do that !! Both inputs are having same hight and width .
Code:
int main()
{
// Open two files to be merged
FILE *fp1 = fopen("D:\\dump\\video1.y", "rb");
FILE *fp2 = fopen("D:\\dump\\video2.y", "rb");
// Open file to store the result
FILE *fp3 = fopen("D:\\dump\\video.y", "wb");
char c; //Change char to int as per answer given by user3710044..
//...Which is working !!
if (fp1 == NULL || fp2 == NULL || fp3 == NULL)
{
puts("Could not open files");
exit(0);
}
// Copy contents of first file to video3.y
while ((c = fgetc(fp1)) != EOF)
fputc(c, fp3);
// Copy contents of second file to video3.y
while ((c = fgetc(fp2)) != EOF)
fputc(c, fp3);
printf("Merged video1.y and video2.y into video.y");
fclose(fp1);
fclose(fp2);
fclose(fp3);
return 0;
}
video1.y and video2.y are of 55 MB .and my output is 3 KB.I am not able to concatenate this two inputs

Answer 1

The type of the c variable is a char this cannot hold the value for EOF and all 256 byte values.
As it happens on your machine char is a signed type so the cast return result from fgetc and the cast value of EOF actually mean that an EOF is found at the end of a file. The problem is that if the file contains an 0xFF byte this is also seen as an EOF.
In summary, change the type of c to an int.