The loop construct found in nearly all imperative programming languages which executes one or more instructions (the "loop body") repeatedly so long as some condition evaluates to true.In contrast to a repeat loop, the loop body will not be executed at all if the condition is false on entry to the while.For example, in C, a while loop is writtenwhile () where is any expression and is any statement, including a compound statement within braces "..".(1995-03-14)