Source code in the xpl0 programming language

func Multiply(A, B);    \the characters in parentheses are only a comment
int  A, B;              \the arguments are actually declared here, as integers
return A*B;            \the default (undeclared) function type is integer
                        \no need to enclose a single statement in brackets
 
func real FloatMul(A, B); \floating point version
real A, B;              \arguments are declared here as floating point (doubles)
return A*B;