Computer Programming C Laboratory: Basic C Programs

Write a C program to check, whether the given Prime or not

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Solving simple scientific and statistical problems - Basic C Programs

Solving simple scientific and statistical problems

Write a C program to check, whether the given Prime or not.

A prime number is an integer which has no proper divisions. For example, 13 is a prime number, because 13 is not divisible by any number other than 1 and 13.

If 'n' has a factor greater than √n, it also has a factor less than √n. So, it is enough to check whether 'n' is divisible by any number between 2 and √n. If divisible, 'n' is not prime, otherwise it is prime.

/* Program to check the given number is prime or not */

#include <stdio.h>

main()

{

/* Local definitions */

int n,i,r;

printf("Enter the positive integer value.....");

scanf("%d", &n);

i=2;

Step1:

if(i<=sqrt(n))

{

r=n%i;

if(r==0)

{

printf("%d is not a prime",n);

goto end;

} /* if */

else

{

i++;

goto stepl;

} /* if else */

printf("%d is prime",n);

end:

printf(" ");

} * main */

OUTPUT

Enter the positive integer value.....3

3 is prime

EXPLANATION: Read n then checks whether the i<=sort(n), if the condition is true if block is executed and prints the entered value is not a prime. Otherwise else part is executed, then the variable i is increased by 1 then goto step1, after completion of else part finally the entered value is printed as prime.

Computer Programming C Laboratory: Basic C Programs : Tag: C Programming : - Write a C program to check, whether the given Prime or not

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Computer Programming C Laboratory: Basic C Programs

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