Size definition of strcat() function

Question

The question is why should I define size of string (string[] should be string[some-number]) When the program is as following it gives me Abort tr

Answer 1

The first parameter of strcat is used to store the result, so it must have enough space for the concatenated string.

In your code:

char buffer1[] = "computer";

is equivalent to:

char buffer1[9] = "computer";

defines a char array with just enough space for the string "computer", but not enough space for the result.