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Update index.md (#31789)

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2019-03-19 22:57:30 +08:00
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guide/english/cplusplus/for-loop/index.md
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@ -5,6 +5,7 @@ title: For Loop
# For Loop
A `for` loop is a repetitive statement that is used to check for some condition and then, based upon the condition a block of code, is executed repeatedly until the specified condition is satisfied.
It is typically used when the number of iterations are known; contrasting to that of a while loop where, generally, the number of iterations is unknown.
The `for` loop is distinguished from other looping statements through an explicit loop counter or loop variable which allows the body of the loop to know the exact sequencing of each iteration.