Answer 1

functions have parameters for example

int doSomthing(int i, int j){
int sum = i+j;
return(sum);}

i and j inside the parenthisis are formal parameters these variables hold the values of the arguments you passed when you make a call to the function.

doSomthing(5,6);

Here 5,6 are actual parameters or just arguments which are passed to the function they are assigned in order so i = 5 & j = 6. inside the body of the function sum is then assigned the value of i+j then returned.

doSomthing(5,6) would return 11