VC + + Debugging methods and techniques

Code style for easy debugging:

No global variables

All variables are initialized, and the member variables are initialized in the constructor

Use const as much as possible

A detailed note

VC + + Compilation options:

Always use the/W4 warning level

Always use the/GZ compilation option in debug builds to discover errors in release releases

Compile without warning: Ensure no warnings after compilation, but carefully check before eliminating warnings

Debug Method:

1. Use Assert (principle: as simple as possible)

The assert only takes effect under debug and is not compiled under release.

Example:

char* strcpy(char* dest,char* source)
{
　　assert(source!=0);
　　assert(dest!=0);
　　char* returnstring = dest;
　　
　　while((*dest++ = *source++)!= ‘\0’)
　　{
　　　　;
　　}
　　return returnstring;
}

2. Defensive programming

Example:

char* strcpy(char* dest,char* source)
{
　　if(source == 0)
　　{
　　　　assert(false);
　　　　reutrn 0;
　　}
　　if(dest == 0)
　　{
　　　　assert(false);
　　　　return 0;
　　}
　　char* returnstring = dest;
　　while((*dest++ = *source++)!= ‘\0’)
　　{
　　　　;
　　}
　　return returnstring;
}