D Programming - Loops

There may be a situation, when you need to execute a block of code several number of times. In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on.

Programming languages provide various control structures that allow more comppcated execution paths.

A loop statement executes a statement or group of statements multiple times. The following general form of a loop statement in mostly used in the programming languages −

D programming language provides the following types of loop to handle looping requirements. Cpck the following pnks to check their detail.

Loop Control Statements

Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed.

D supports the following control statements −

The Infinite Loop

A loop becomes infinite loop if a condition never becomes false. The for loop is traditionally used for this purpose. Since none of the three expressions that form the for loop are required, you can make an endless loop by leaving the conditional expression empty.

import std.stdio;

int main () {

   for( ; ; ) {
      writefln("This loop will run forever.");
   }
   return 0;
}

When the conditional expression is absent, it is assumed to be true. You may have an initiapzation and increment expression, but D programmers more commonly use the for(;;) construct to signify an infinite loop.

NOTE − You can terminate an infinite loop by pressing Ctrl + C keys.