Without parameters

Functions

With a return value
Without a return value
Multiple return values
Without parameters
Array of parameters
In-out parameters
Modifying parameters
Optional parameter values
Recursion

//(void) means "no parameters";
//since C23 empty () means the same
void sayGoodbye(void) {
printf("Goodbye!\n");
}

sayGoodbye();
//prints "Goodbye!"

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