#include<stdio.h>

int check_prime(int num);

int main()

{

int n1,n2,i,flag;

printf("Enter two numbers(intervals): ");

scanf("%d %d",&n1, &n2);

printf("Prime numbers between %d and %d are: ", n1, n2);

for(i=n1+1;i<n2;++i)

{

flag=check_prime(i);

if(flag==0)

printf("%d ",i);

}

return 0;

}

int check_prime(int num) /* User-defined function to check prime number*/

{

int j,flag=0;

for(j=2;j<=num/2;++j){

if(num%j==0){

flag=1;

break;

}

}

return flag;

}

Output:-

int check_prime(int num);

int main()

{

int n1,n2,i,flag;

printf("Enter two numbers(intervals): ");

scanf("%d %d",&n1, &n2);

printf("Prime numbers between %d and %d are: ", n1, n2);

for(i=n1+1;i<n2;++i)

{

flag=check_prime(i);

if(flag==0)

printf("%d ",i);

}

return 0;

}

int check_prime(int num) /* User-defined function to check prime number*/

{

int j,flag=0;

for(j=2;j<=num/2;++j){

if(num%j==0){

flag=1;

break;

}

}

return flag;

}

Output:-

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