What is the main logic behind file comparison in C?

The program reads both files at the same time, compares their contents line by line using strcmp(), and reports the line number where they first differ or confirms if both files are identical.

What happens if one file ends before the other while comparing two files using C?

If one file reaches its end first, the program detects that condition and reports which file ended early, meaning the files are not identical.

How do I handle errors in a C program to compare two files?

Always check if fopen() returns NULL. If yes, display an error message using perror() and stop execution to avoid undefined behavior during file reading.

What is the easiest way to compare two files in C program?

The easiest way is to use a loop with fgetc() or fgets() and check each character or line. If anything doesn’t match, print that the files are different.

Is it possible to compare two files using C and ignore spaces or tabs?

You can skip spaces and tabs while reading characters. Just add a condition to ignore ' ' and '\t'. This helps in cleaner file comparison in C when formatting doesn’t matter.

Can the C program to compare two files show total number of differences?

Yes, by using a counter variable, you can track how many lines differ while reading the files. After finishing the loop, you can print the total mismatch count.