Loop Contro in C : for loop

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Loop Control in C : for loop

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Syntax :

                 for(expression1 ; expression2 ; expression3)             

                  {
                             body;
                  }

expression1	Initialization
expression2	Test Condition
expression3	Update Expression

Execution :

1. Expression1 is evaluated only once at the beginning .
2. Expression2 is test Condition which is executed before executing body of the loop,if TEST CONDITION is true then only the Body of Loop is Executed.
3. Expression3 is update Expression.It alters the value of Loop Control Variable

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Example :

                         for ( i=0 ; i<100 ; i++ )

                         {

                          printf("Hi");

                         }

i	Subcript/Counter/Loop Control  Variable
i=0	Initialization
i<100	Test Condition
i++	Update Expression

Result :

• It will Print the "Hi" 100 times

Steps : 

1. Refer to Topmost fig. Initially i = 0 initializes Loop Control Variable.
2. It is checks with i<100 condition .
3. Condition is found to be True. So it will Execute the Body of Loop.
4. After execution , It will Execute Expression3 ( Update ) Now i = 1;
5. Condition is again True so again body of loop is executed ,
6. Similarly Body of loop is executed 100 times.
7. At the end i = 100 & i<100 Condition violets So it bypasses the Loop body

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Different Forms of For Loop

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Posted in: Loop Control : for