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**C program to find prime numbers**

#include<stdio.h>
int main(){
int num,i,count=0;
printf("Enter a number: ");
scanf("%d",&num);
for(i=2;i<=num/2;i++){
if(num%i==0){
count++;
break;
}
}
if(count==0 && num!= 1)
printf("%d is a prime number",num);
else
printf("%d is not a prime number",num);
return 0;
}

output:

Enter a number: 11

11 is a prime number

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C program to determine prime number. Determining if a number is prime in c. C program to find given number is prime or not