Question

What is the syntax of the do/while loop in C?

Answer 1

In C programming, the syntax for the do/while loop is as follows:

do {
    // Code block to be executed
} while (condition);
 

Here's a breakdown of each component of the syntax:

1. do: The keyword "do" marks the beginning of the do/while loop.

2. { }: The code block enclosed within curly braces contains the statements that will be executed repeatedly.

3. while: The keyword "while" is followed by a condition enclosed within parentheses. This condition determines whether the loop should continue iterating or not.

4. condition: The condition is a Boolean expression that is evaluated at the end of each iteration. If the condition evaluates to true, the loop will continue executing; otherwise, the loop will terminate.

It's worth noting that the condition in the do/while loop is evaluated after the code block has been executed. This guarantees that the code block will be executed at least once, regardless of the condition.

Here's an example to illustrate the syntax of the do/while loop in C:

#include <stdio.h>

int main() {
    int i = 1;
    do {
        printf("%d ", i);
        i++;
    } while (i <= 5);
    
    return 0;
}
 

In this example, the do/while loop will print the numbers from 1 to 5. The loop will execute at least once, printing the initial value of i, and then it will continue iterating as long as i is less than or equal to 5.

Output:

1 2 3 4 5
 

Remember to include the necessary header files and end the program with a return statement.