34. Program that inputs starting and ending numbers and display all prime number ending with digit 7 between the given range in descending order.

Chapter 6: 

Looping Structures

Programming Exercise

Problem # 34:

Write a program that inputs starting and ending numbers and display all prime number ending with digit 7 between the given range in descending order.

Solution:

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
    int c, e_num, s_num, p;
    cout<<"Enter starting number:";
    cin>>s_num;
    cout<<"\nEnter a number upto which prime numbers are required:";
    cin>>e_num;
    for(;e_num>s_num;e_num--)
    {
        p=1;
        for(c=2;c<e_num;c++)
        if(e_num%c==0)
        {
        p=0;
        break;
        }
  
    if(p==1&&(e_num%10==7))
    cout<<endl<<e_num<<" is a prime number ending with digit 7.";
    }
    getch();
}

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35. Program that displays all prime numbers between 100 and 500 that are also palindrome.