Has TRUE always had a non-zero value?

Question

I have a co-worker that maintains that TRUE used to be defined as 0 and all other values were FALSE. I could swear that every language I\'ve worked with, if you could even

Answer 1

I worked at a company with a large amount of old C code. Some of the shared headers defined their own values for TRUE and FALSE, and some did indeed have TRUE as 0 and FALSE as 1. This led to "truth wars":

/* like my constants better */
#undef TRUE
#define TRUE 1

#undef FALSE
#define FALSE 0