You just need to pass parameters no need specify parameter type when calling the function in c.
Change
h=add(int x, int y);
to
h=add(x,y);
have a look at this:-http://www.techcrashcourse.com/2015/05/c-programming-function-calling.html
solved given two integers write a program that uses function add() to add these numbers and sub() to find the difference [closed]