What tasks can be performed in the three sections of a for loop in addition to initializing a single variable, testing the variable, and incrementing it?

Question

What will be an ideal response?

Answer 1

Although the three sections of the for loop are most commonly used for initializing a variable, testing it, and incrementing it, you can also perform other tasks:
* You can initialize more than one variable by placing commas between the separate statements, as in the following:
for(g = 0, h = 1; g < 6; ++g)
* You can declare a new variable, as in the following:
for(int k = 0; k < 5; ++k)
This technique is used frequently when the variable exists only to control the loop and for no other purpose. When a variable is declared inside a loop, as k is in this example, it can be referenced only for the duration of the loop body; then it is out of scope.
* You can perform more than one test by evaluating compound conditions, as in the following:
for(g = 0; g < 3 && h > 1; ++g)
* You can decrement or perform some other task at the end of the loop's execution, as in:
for(g = 5; g >= 1; --g)
* You can perform multiple tasks at the end of the loop's execution by separating the actions with commas, as in the following:
for(g = 0; g < 5; ++g, ++h)
* You can leave one or more portions of the for expression empty, although the two semicolons are still required as placeholders to separate the three sections.