How do you call a function in C?

"18.1.4. Calling Functions Once a function has been defined, or at least a prototype has been brought into scope via an #include statement, you can write code to call your function(s). The syntax for doing so is to simply provide the function name followed by parentheses containing values or variables to pass to the function. Some examples: 1 int a = 10, b = 20; 2 int c = sum(a, b); //c contains the value 30 3 4 //invoke a function with literal values: 5 double dist = getDistance(0.0, 0.0, 10.0, 20.0); 6 7 //invoke a function with a combination: 8 double p = 1500.0;"