NIELIT O Level January 2016 Solve paper
Q 7 b.(ii) while and do..while loops
Iteration
statements allow the set of instructions to execute repeatedly till the
condition doesn’t turn out false. The Iteration statements in C for while loop
and do while loop. These statements are commonly called loops. Here, the main
difference between a while loop and do while loop is that while loop check
condition before iteration of the loop, whereas do-while loop, checks the
condition after the execution of the statements inside the loop.
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BASIS FOR COMPARISON
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WHILE
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DO-WHILE
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Syntax
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while ( condition) {
statements; //body of loop } |
do{
. statements; // body of loop. . } while( Condition ); |
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Controlling Condition
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In 'while' loop the controlling condition
appears at the start of the loop.
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In 'do-while' loop the controlling
condition appears at the end of the loop.
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Iterations
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The iterations do not occur if, the
condition at the first iteration, appears false.
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The iteration occurs at least once even
if the condition is false at the first iteration.
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