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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 # 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. 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. 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.