The document discusses different loop structures in Turbo C++ including for loops, while loops, and do-while loops. For loops allow code to be repeatedly executed and include an initialization, condition, and increment/decrement statement. While loops repeat code as long as a condition is true and check the condition before each iteration. Do-while loops are similar to while loops but check the condition after executing the loop code, so the code runs at least once.

2. In Turbo C++, a for
loop is a control flow
statement that allows
code to be executed
repeatedly.

3. for (initialization;
condition;
increment/decrement) {
// code to be
executed
}

4. Initialization: This is where you initialize your
loop counter. This statement is executed only
once.
Condition: This is a boolean expression that the
system checks before each loop iteration. If it’s
true, the loop continues; if it’s false, the loop
ends.
Increment/Decrement: This statement is
executed at the end of each loop iteration.

5. #include<iostream.h>
#include<conio.h>
void main() {
clrscr();
for(int i = 1; i <= 10; i++) {
cout << i << "n";
}
getch();
return 0;
}

6. A while loop in programming is a control flow
statement that allows a certain piece of code to
be executed repeatedly based on a given
Boolean condition. The while loop can be
thought of as a repeating if statement. The
code inside the loop is executed, and then the
Boolean condition is evaluated. If the condition
is true, the code inside the loop is executed
again. This repeats until the condition becomes
false.

7. while(condition) {
// code to be
executed
}

8. int i = 0;
while(i < 5) {
cout << i << "n";
i++;
}

9. Condition: This is a Boolean expression that is
checked before each iteration of the loop. If the
condition is true, the loop continues; if it’s
false, the loop ends and control passes to the
next line of code after the loop.
Code to be executed: This is the code that is
run for each iteration of the loop, as long as the
condition is true.

10. A do-while loop in Turbo C++ is a
variant of the while loop. Unlike the
while loop, the do-while loop
checks the condition after
executing the statements within the
loop. This means that the do-while
loop will execute its statements at
least once, even if the condition is
false.

11. do {
// code to be
executed
} while(condition);

12. #include<iostream.h>
#include<conio.h>
main() {
clrscr();
int i = 1;
do {
cout << i << "n";
i++;
} while(i <= 5);
getch();
return 0;
}