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C program to check prime number


The below program checks if a number is a prime or a composite number. The C printf statement is used to output the result on the screen.
C program to check prime number

#include <stdio.h>
 
void main()
{
 
int x,i;
int count = 0;    
 
printf("Enter a number:");    
scanf("%d",&x);  
 
for (i=1; i<=x; i++)  
{
 
if ((x % i)==0)  
{  
count++;  
}  
}  
 
if (count<3)  
{  
printf ("%d is a prime number.", x);  
}
 
else
{
printf ("%d is not a prime number.", x);  
}
}

Output

Enter a number:13
13 is a prime number.
Posted in C   
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