Assalamu Alaikum. Hope, you all are well by the grace of Almighty ALLAH. Today we learn how to count prime numbers between limits. Take a look at the problem.

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Now, take a look at the program.

**Problem:**Write a program that prints the number of total prime numbers between**X**and**Y**, where**Y**>**X**. If**X**is lower than**Y**, a message will be given "**Invalid Range**".**Solution:**A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Now, take a look at the program.

We can also do this program by using a flag. Now take a look at the following program.

Thank You all..

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