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### 6.4. Examples Using the for Statement

The following examples show techniques for varying the control variable in a `for` statement. In each case, we write the appropriate `for` header. Note the change in the relational operator for loops that decrement the control variable.

a) Vary the control variable from `1` to `100` in increments of `1`.

for ( int i = 1; i <= 100; ++i )

b) Vary the control variable from `100` to `1` in decrements of `1`.

for ( int i = 100; i >= 1; --i )

c) Vary the control variable from `7` to `77` in increments of `7`.

for ( int i = 7; i <= 77; i += 7 )

d) Vary the control variable from `20` to `2` in decrements of `2`.

for ( int i = 20; i >= 2; i -= 2 )

e) Vary the control variable over the sequence `2`, `5`, `8`, `11`, `14`, `17`, `20`.

for ( int i = 2; i <= ...

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