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Prime Number program in C

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robaa
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2022-11-13
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Prime number in C: Prime number is a number that is greater than 1 and divided by 1 or itself. In other words, prime numbers can't be divided by other numbers than itself or 1. For example 2, 3, 5, 7, 11, 13, 17, 19, 23.... are the prime numbers.

Note: Zero (0) and 1 are not considered as prime numbers. Two (2) is the only one even prime number because all the numbers can be divided by 2.

Write a c program to check prime number.

Input: 44

Output: not prime number

Input: 7

 

Output: prime number

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robaa
2022-11-13
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Let's see the prime number program in C. In this c program, we will take an input from the user and check whether the number is prime or not.

#include<stdio.h>  
int main(){    
int n,i,m=0,flag=0;    
printf("Enter the number to check prime:");    
scanf("%d",&n);    
m=n/2;    
for(i=2;i<=m;i++)    
{    
if(n%i==0)    
{    
printf("Number is not prime");    
flag=1;    
break;    
}    
}    
if(flag==0)    
printf("Number is prime");     
return 0;  
 }

Output:

Enter the number to check prime:56
Number is not prime

Enter the number to check prime:23
Number is prime

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