What does =+ mean in C?

Question

I came across =+ as opposed to the standard += today in some C code; I\'m not quite sure what\'s going on here. I also couldn\'t find it in the doc

Answer 1

After reading your question I just investigated on these. Let me tell you what I have found. Tried it on gcc and turboc. Did not make it sure on Visual Studio as I have not installed it on my pC

  int main()
  { 
   int a=6;
   a =+ 2;
   printf("%d",a);
  }  o/p , a value is 2

  int main()
  {
   int a=6;
   a =- 2;
   printf("%d",a);
  } o/p , a value is -2 

I dont know about the other answers as they said its an ancient version of C.But the modern compilers treat them as a value to be assigned ( thats positive or negative nothing more than that) and these below code makes me more sure about it.

  int main()
  { 
   int a=6;
   a =* 2;  \\ Reporting an error inavlid type of argument of unary *
   printf("%d",a);
  } 
 if *= is equal to =* then it should not report error but its throwing an error