The for loop executes a block of code repeatedly until the specified expression evaluates to false. You can define a for loop as follows.

for ([initializer(s)]; [condition]; [iterator]) 
   // code to repeat goes here

The [initializer(s)] portion is used to initialize a value, or values, as a counter for the loop. On each iteration, the loop checks that the value of the counter is within the range to execute the for loop, specified in the [condition] portion., and if so, execute the body of the loop.   At then end of each loop iteration, the[iterator] section is responsible for incrementing the loop counter.

The following code example shows how to use a for loop to execute a code block 10 times.

for Loop
for (int i = 0 ; i < 10; i++) 
    // Code to execute.
In this example, i = 0; is the initializer, i < 10; is the condition, and i++ is the iterator. 

This contents come from edx : Introduction to C++

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