Introduction
This article focuses on a C program to print multiples of 5 using the do-while loop, providing step-by-step explanations and examples to help you understand the concept better.
In the world of programming, loops are an essential construct that allows repetitive execution of a block of code.
One such loop is the do-while loop, which ensures that the code is executed at least once before checking the condition for further execution.
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How Does the Do-While Loop Work?
The do-while loop in C works by executing a block of code and then checking the loop condition.
If the condition evaluates to true, the code block is executed again. This process continues until the condition evaluates to false.
Syntax of the Do-While Loop
The syntax of the do-while loop in C is as follows:
do {
// Code block
} while (condition);
The code block is executed first, and then the condition is checked. If the condition is true, the loop continues.
Otherwise, the loop terminates, and the program proceeds to the next statement after the loop.
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C Program: Print Multiples of 5 Using Do While Loop
Now, let’s dive into the C program that prints multiples of 5 using the do-while loop. Here’s the code:
#include <stdio.h>
int main() {
int num = 1;
do {
if (num % 5 == 0) {
printf("%d ", num);
}
num++;
} while (num <= 100);
return 0;
}
Explanation of the Program
- We start by including the necessary header file,
stdio.h
, which allows us to use theprintf
function to print the multiples of 5. - Inside the
main
function, we declare an integer variablenum
and initialize it to 1. This variable will keep track of the numbers we want to check for multiples of 5. - The do-while loop begins. Inside the loop, we check if
num
is divisible by 5 using the modulo operator (%
). If the remainder is 0, it meansnum
is a multiple of 5, so we print it using theprintf
function. - After printing the number, we increment
num
by 1. - The condition
num <= 100
is checked at the end of each iteration. If it evaluates to true, the loop continues, and the process repeats. If it evaluates to false, the loop terminates, and the program exits. - Finally, the
main
function returns 0, indicating successful program execution.
Output of the Program
When you run the program, it will print the multiples of 5 between 1 and 100, inclusive:
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
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Frequently Asked Questions (FAQs)
The do-while loop ensures that the code block is executed at least once, regardless of the initial condition. In this program, it allows us to print the first multiple of 5, which is 5 itself.
Yes, we can achieve the same result using a while loop. However, in that case, we would need to initialize the variable num
to 5 before entering the loop. The do-while loop simplifies the program by allowing us to start with num = 1
.
To print multiples of a different number, you need to modify the condition inside the if statement. For example, to print multiples of 3, you would use the condition num % 3 == 0
.
num++
statement from the program? If we remove the num++
statement, the program would enter an infinite loop because the value of num
would never change. It is essential to increment num
to avoid infinite looping.
Yes, we can modify the program to print multiples of 5 in reverse order. To do this, we can start with num = 100
and decrement num
by 1 inside the loop.
To print a specific number of multiples, you can introduce a counter variable and terminate the loop when the counter reaches the desired number. For example, if you want to print the first 10 multiples, you can introduce a counter variable and set the condition to counter <= 10
.
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Conclusion
The C program to print multiples of 5 using the do-while loop demonstrates the fundamental concept of loops and conditional statements.
By understanding the structure and syntax of the do-while loop, you can easily adapt it to solve various programming problems.
Remember to keep the loop condition in mind to avoid infinite loops and ensure your program executes efficiently.