C++

Can anyone tell me if it is possible to call a function inside another function without using all of its parameter.

For ex

void FunctionA ( int a, int b, int c, int ){

....

}

void FunctionB( int a, int b){

//calling FunctionA inside FunctionB

FunctionA(a,b, c);

}

So basically I got an error because the number of arguments don't match.. but I don't need the last argument in function A to be called. So what should I do? And please give an example thanks!