A Beginner's Guide to D/Conditions and Loops/Simple Branching
The if Conditional
editExample: More Complicated Input - a program that asks age and makes a "clever" response
import std.c.stdio;
import std.stdio;
void main()
{
// Create a variable that can hold an integer
int age;
// writef does not flush on all platforms. If you remove fflush
// below, the text might be written after you enter your number.
writef("Hello, how old are you? ");
fflush(stdout);
// scanf reads in a number. %d tells scanf it is a number and the number
// is placed in the variable 'age'.
// The & sign in &age tells the compiler that it is a reference to the
// variable that should be sent.
scanf("%d",&age);
// Print different messages depending on how old the user is.
if(age < 16)
{
// If age is below 16 you are not allowed to practice car-driving in Sweden
writefln("You are not old enough to practice car driving!");
}
else if (age < 18) /* 16 <= age < 18 */
{
writefln("You may practice if you have a permission, but not drive alone!");
}
else /* You are at least 18 so everything should be alright */
{
writefln("You may drive as long as you have a licence!");
}
}