Skip to main content

#primenumber #givennumberprimeornot CHECK THE GIVEN NUMBER IS PRIME OR N...



Problem Description
This program takes a number and checks whether a given number is prime or not.

Problem Solution
1. Take a number as input.
2. Check if the number is divisible by any of the natural numbers starting from 2.
3. If it is, then it is not a prime number. Otherwise it is a prime number.
4. Exit.

Program/Source Code
Here is source code of the C program to check if a given number is prime. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

/*
* C program to check whether a given number is prime or not
* and output the given number with suitable message.
*/
#include
#include

void main()
{
int num, j, flag;

printf("Enter a number \n");
scanf("%d", &num);

if (num <= 1)
{
printf("%d is not a prime numbers \n", num);
exit(1);
}
flag = 0;
for (j = 2; j <= num / 2; j++)
{
if ((num % j) == 0)
{
flag = 1;
break;
}
}
if (flag == 0)
printf("%d is a prime number \n", num);
else
printf("%d is not a prime number \n", num);
}
Program Explanation
1. Take a number as input and store it in the variable num.
2. If the number is lesser than or equal to 1, then print the output as ” It is not a prime number”.
3. Initialize the variable flag to zero.
4. Using for loop, check if the input number is divisible by any of the natural numbers starting from 2.
5. If it is, then assign the variable flag with 1.
6. Print the output as “It is a prime number”, if the variable flag ==0.
7. Otherwise print the output as “It is not a prime number” and exit.

Runtime Test Cases

Enter a number
23
23 is a prime number


Enter a number
15
15 is not a prime number
Sanfoundry Global Education & Learning Series – 1000 C Programs.

Here’s the list of Best Reference Books in C Programming, Data-Structures and Algorithms

If you wish to look at other example programs on Mathematical Functions, go to C Programming Examples on Mathematical Functions. If you wish to look at programming examples on all topics, go to C Programming Examples.
« Prev Page - C Program to Read Two Integers M and N & Swap their Values
» Next Page - C Program to Find the GCD and LCM of Two Integers
1

Deep Dive @ Sanfoundry:
C++ Programming Examples on Numerical Problems & Algorithms
C Programming Examples on Strings
C Programming Examples on Mathematical Functions
C# Programming Examples on Mathematics
C# Programming Examples on Events
C Programming Examples on Numerical Problems & Algorithms
C# Programming Examples on Matrix
C Programming Examples on Bitwise Operations
Java Programming Examples on Mathematical Functions

Comments

Post a Comment

Popular posts from this blog

How to Send OTP in Mobile Number | login with OTP mobile Number | How to send OTP in mobile no with Spring Boot APP

   ðŸ˜‚               Login with Mobile Number OTP ---------------------------------------------------------------------------- If you want to develop a project to log in with OTP mobile Number in Spring Boot Applications then this post for you. In this post, I am going to use some other service to send the OTP in mobile number. we have to use it in this project spring boot. we are going to use Twilio to send SMS. we are going to use a web socket to send the data from the browser to the SMS gateway. Oracle Database for store the user details. org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-thymeleaf 2.3.3.RELEASE com.twilio.sdk twilio 7.1.0 org.springframework.boot spring-boot-starter-websocket org.springframework.boot spring-boot-devtools runtime true package com.app; impo...
Post a Comment
Read more

How can we create Auto generated field or ID for mongodb using spring boot

😂 How can we create an Auto-generated field or ID for MongoDB using spring boot? First Create One Application Like Mongodb_sequence-id-generator Pom.XML org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-data-mongodb de.flapdoodle.embed de.flapdoodle.embed.mongo User.java package com.app; import org.springframework.data.annotation.Id; import org.springframework.data.annotation.Transient; import org.springframework.data.mongodb.core.mapping.Document; @Document(collection = "users_db") public class User { @Transient public static final String SEQUENCE_NAME = "users_sequence"; @Id private long id; private String firstName; private String lastName; private String email; public User() { } public User(String firstName, String lastName, String email) { this.firstName = firstName; this.lastName = la...
1 comment
Read more

Send Email with Spring Boot API | Spring Boot API send email

              😂How to Send Email with Spring Boot API In this post, we are going to implement a project like send an email to the given email Id with Spring Boot we can do this. In this project, users have to send emails and we have to send the email for forgetting the password. Send Email with Spring Boot API 1.pom.xml   Add this despondency . org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test org.springframework.boot spring-boot-starter-mail 2.application.properties file Add this one server.port=8023 spring.mail.host=smtp.gmail.com spring.mail.port=587 spring.mail.username=technoidentity.vitalz@gmail.com spring.mail.password=technoidentity12345 # Other proper...
Post a Comment
Read more