What will this C code do?

void main(){
int x=1;
printf("%d\n",x=2);
}

>>59
I stopped reading the article at

"Use of an uninitialized variable: This is commonly known as source of problems in C programs and there are many tools to catch these: from compiler warnings to static and dynamic analyzers. This improves performance by not requiring that all variables be zero initialized when they come into scope (as Java does). For most scalar variables, this would cause little overhead, but stack arrays and malloc'd memory would incur a memset of the storage, which could be quite costly, particularly since the storage is usually completely overwritten."

This isn't always true. However wrote this crap needs to go relearn the concept of a "translation unit" in ANSI/ISO C.