“The “Lazy Programmer” theory
One theory for the origin of the camel case convention holds that C programmers and hackers simply found it more convenient than the standard underscore-based style.
The underscore key is inconveniently placed on american QWERTY keyboards. Additionally, in some fonts the underscore character can be confused with a minus sign; it can be overlooked because it falls below the string of characters or it can be lost entirely when displayed or printed underlined or when printed on a dot-matrix printer with a defective pin or misaligned ribbon. Moreover, early compilers severely restricted the length of identifiers (e.g., to 8 or 14 letters) or silently truncated all identifiers to that length. Finally, the small size of computer displays available in the 1970s encouraged the use of short identifiers. Many C programmers opted to use camel case instead of underscores, for it yielded legible compound names with fewer keystrokes and fewer characters.”
UpperCamelCase or PascalCase
lowerCamelCase or camelCase
