Exclamation mark in C?

Question

What does exactly mean when they use the exclamation mark before the (function or whatever )?
Like this example :

(!strcmp(old_ct.name,cts[i].name)&& !strcmp(old_ct.prenom,cts[i].prenom))

Answer 1

! negates the statement: !true == false

Answer 2

Logical operatior strcmp return 0 if both string are equal and !0 is 1
&& and logical operator which return true if both condition are true ..