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Data Definitions
va_start(al, count);
while(count--) {
//get an int from the list
x = var_arg(al, int);
sum += x;
}
//stop using the list
va_end(al);
return(sum);
}
Some examples of using this new function:
x=Sum(5, 10, 20, 30, 40, 50);
y=Sum(3, a, b, c);
Default Parameters
Default parameters allows a function to have default values if nothing is passed to it when
called.
int mygetc(char *c, int n=100){
}
This function waits n milliseconds for a character over RS232. If a character is received, it saves
it to the pointer c and returns TRUE. If there was a timeout it returns FALSE.
//gets a char, waits 100ms for timeout
mygetc(&c);
//gets a char, waits 200ms for a timeout
mygetc(&c, 200);
Overloaded Functions
Overloaded functions allow the user to have multiple functions with the same name, but they
must accept different parameters. The return types must remain the same.
Here is an example of function overloading: Two functions have the same name but differ in the
types of parameters. The compiler determines which data type is being passed as a parameter
and calls the proper function.
This function finds the square root of a long integer variable.
long FindSquareRoot(long n){
}
This function finds the square root of a float variable.
float FindSquareRoot(float n){
}
FindSquareRoot is now called. If variable is of long type, it will call the first FindSquareRoot()
example. If variable is of float type, it will call the second FindSquareRoot() example.
result=FindSquareRoot(variable);
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