Why do my programs keep coming up as NTVDM CPU illegal instruction?

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SUMMARY

The discussion centers on the issue of receiving an "NTVDM CPU illegal instruction" error when running C++ programs on Windows XP Version 2002 using freecommandLinetools as a compiler. The problem arises due to the use of an outdated operating system that no longer receives support, leading to compatibility issues with modern hardware opcodes. The specific code example provided contains a syntax error in the use of 'count' instead of 'cout', which also contributes to the program's failure to execute correctly.

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  • Familiarity with Windows XP operating system limitations
  • Knowledge of compiler functionality and compatibility issues
  • Basic troubleshooting skills for legacy software environments
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nst.john
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I am using Windows XP Version 2002 and I am using freecommandLinetools as a compiler for the c++ language. Every time I write a program it always says it is an NTVDM CPU illegal instruction and it doesn't work, what's wrong with my programs? Here is an example:
C:
#include <iostream>

using namespace std;

int main()
{
  count<<"HEY, you, I'm alive! Oh, and Hello World!\n";
  cin.get();

  return 1;
}
Is something wrong with my program? Or do I need a new compiler for my computer, or what ever? What's the problem? Thanks in advance!
 
Last edited by a moderator:
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XP systems stopped being supported in the summer of 2010. Getting a new compiler will be difficult, but it does appear to me to be a compiler problem - it requests a hardware opcode your system does not support. As a last ditch effort try this as a fix - it is a guess on my part.:

 

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