C-06

Lecture 6Version 1.0

The for LoopThe break Statement

The continue StatementVersion 1.0

Rushdi Shams, Dept of CSE, KUET, Bangladesh

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The for Loop

The for loop allows us to specify three things in a single line:

1. Setting a loop counter to an initial value.2. Testing the loop counter to determine whether its

value has reached the number of repetitions desired.3. Increasing/decreasing the value of loop counter each

time the program segment within the loop is executed.


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General form of for loop


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Example of for loop This program prints number 1 to 10


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Structure of for loop


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Variation of for loop


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Variation of for loop: Infinite loop


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Observing for loops

The initialization, loop-continuationcondition and increment/decrement cancontain arithmetic expressions. Assumethat x=2 and y=10. The statement-for(j=x; j<=4*x*y; j=j+y/x)

is equivalent to-for(j=2; j<=80; j=j+5)


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Observing for loops

There can be a decrement as well (or you

can say a negative increment). Forexample-


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Observing for loops

If the loop continuation condition is initially

false, the body portion of the loop is notperformed.


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Observing for loops


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Qs


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Nested for loops


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Output


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What will be the output?


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What will be the output?


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The break Statement

We often come across situations where we want to jump out of a loop instantly, without waiting to get back to the conditional test.

The keyword break allows us to do this.


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The break Statement

When break is encountered inside any loop, control automatically passes to the first statement after the loop.


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The break Statement


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The continue Statement

In some programming situations we want to take the control to the beginning of the loop, bypassing the statements inside the loop, which have not yet been executed.


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The keyword continue allows us to do this. When continue is encountered inside any loop, control automatically passes to the beginning of the loop.


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