# C Program to Check Number is Circular Prime or Not

Write a program to check whether a given number is circular prime or not

Note:Â A number is said to be aÂ circular primeÂ if all its possible rotations are also prime numbers.
Example:Â 113 is a circular prime since 311 and 131 are also prime

Input Format
The input contains an integer

Output Format
Print CIRCULAR PRIME or NOT CIRCULAR PRIME

Sample Input 1

3119

Sample Output 1

CIRCULAR PRIME

## Code:

# include <stdio.h>
# include <stdlib.h>
# include <stdbool.h>
# include <math.h>

int flg;
void chkPrime(long int n)
{
long int i;
i=n-1;
while(i>=2)
{
if(n%i==0)
{
flg=1;
}
i--;
}
}
void AllCombination(long int a)
{
long int b1,c1,d1,e1,i,j,k,s1,z1,v1,x[8],y[8],m;
b1=a;
i=0;
while(b1>0)
{
y[i]=b1 % 10;
b1=b1/10;
i++;
}
c1=0;
for(j=i-1;j>=0;j--)
{
x[c1]=y[j];
c1++;
}
m=i;
while(m>0)
{
c1=m-1;
d1=i-1;
e1=0;
s1=0;
while(e1<i)
{
z1=pow(10,d1);
v1=z1*x[c1%i];
c1++;
d1--;
e1++;
s1=s1+v1;
}
m--;
chkPrime(s1);
}
}
int main()
{
long int num1;
scanf("%li",&num1);
flg=0;
AllCombination(num1);
if(flg==0)
{
printf("CIRCULAR PRIME");
}
else
{
printf("NOT CIRCULAR PRIME");
}
return 0;
printf("\n");
}
Code language: C/AL (cal)
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