What is an auto function in D programming?
Chinweuba Elijah AzubuikeWhat is a function?
Functions are code blocks that carry out specific executions in an application. This code block can be called more than once during the application’s runtime.
What is the Auto function?
Auto functions are functions without restrictions to their return value type. Let’s see an example.
Example
import std.stdio;
auto multiply(int val1, double val2) {
double output = val1 * val2;
return output;
}
void main() {
int x = 1;
double y = 2.5;
writeln("multiply(x,y) = ", multiply(x, y));
}Code explanation
In the code example above we are performing a simple multiplication operation to demonstrate the auto function.
-
Line 2: We define our
multiplyfunction, notice theautokeyword used while declaring the function. We also passed in parameters that we use in the function. -
Line 3: We define our variable
outputas a data type ofdouble. -
Line 4: We return the created variable even though it is a
doubledata type. -
Lines 8–9: We define and assign values to our variables
xandy. -
Line 11: We print out the result by calling the
multiplyfunction inside of thewriteln()method.
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