Prime number check programme doubt

#1

To check if a number is prime or not i tried it like this but in sublime text 3 it is showing errors in this program but in turbo c++ this program is giving no error and giving the desired output. please explain why is this happening?
#include
using namespace std;
int main()
{
int a,i;
cout<<“enter a number”;
cin>>a;
for(i=2;i<=a-1;i++)
{
if(a%i==0)
{
cout<<“entered no. is not prime”;
goto end;
}
else
{
goto start;
}
start:

}

cout<<"Entered no. is prime";

end:
return 0;
}

#2

@Sheenagoyal21
I highly recommend you to stop using TurboC++ for any and all purposes and switch to better IDEs like Code::Blocks , Visual Studio or Sublime Text Editor as you are already using for practicing and writing codes. The reason for this is that TurboC++ is a very old compiler which was outdated in 1980s … outdated in the 80s. It uses old C++ standards and does not provide nearly 1/10th of the functionality provided by these other modern IDEs.
The problem you are facing is because of this reason only , your code works as per older C++ standards hence it does not give you any problem in TurboC++ but reports an error as per modern C++ standards. Hence Sublime Text 3 reports this code as invalid.
Uninstall TurboC++ altogether as it is useless. It was only good for 11th 12th coding.
You can also try Coding Blocks IDE ( ide.codingblocks.com ) as it works as per latest C++ standards.

#3

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