I'm very confused. I'm writing a C program but keep getting segmentation faults when i get to the if-statement. the weirdest thing is that the program works if the statement ends up being true. i get the seg-faults when its false. here's the notorious if-statement:

if ( !strncmp( text, "ATOM ", 5) && text[13] != 'H' ) {
blah blah blah
}

thanks a lot to anyone who can help

How is text defined ? What are examples of text ? What is the example when it fails ? Have you tried to split the if statement into 2 if statements - this would possibly eliminate one of the conditionals as being the problem ?