CODEWITHSUNDEEP
c++do-while
Ismail.ethio
Ismail.ethio

Reputation: 35

The issue of using Do-While loop in C++?

I have tried to list prime numbers using C++ Do-While loop but I have trouble and not found problems inside my code. Can any one help me in this?

I have tried so far:

#include <iostream>
using namespace std;
int main()
{
int num2check = 3, innerCheck;
bool isPrime;
do
{
  isPrime = true;
  innerCheck = 2;

  while ((innerCheck < num2check) && (isPrime == true));
  {

    if (num2check % innerCheck == 0)
    {
     isPrime = false;
     break;
    }
      else 
      {
       innerCheck++;
      }
  }
  if (isPrime == true)
  {
  cout << num2check << " is prime.";
  num2check++;
  }
  else
  {
  num2check++;
  }
}while(num2check < 50);
return 0;
}

Upvotes: 0

Views: 100

Answers (1)

Tejendra
Tejendra

Reputation: 1944

You need to remove the semicolon in this line 

 while ((innerCheck < num2check) && (isPrime == true));

In programming standards, the ; signifies an end of statement, or in this case that it is a null statement, so here the while loop doesn't executes anything and keeps on running in infinite loop as the condition will always holds true

Upvotes: 4

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