PocketC桌面版的原版帮助文件PocketC语言摘要BriefPocketCLanguage.docVIP

PocketC Language The language is very similar to standard C in syntax, but has a different feature set. Most notably, there are no structs, no typedefs, and some operators are not supported, such as the comma and the conditional operator (?:). A string data type has been added, and values are somewhat loosely typed. The next section is for those who are already somewhat familiar with C. A complete guide is also available for those not familiar with C. Brief guide to the PocketC language Data Types There are five types in PocketC: 32-bit signed integers (int), 32-bit floating point numbers (float), 8-bit signed characters (char), null-terminated strings (string), pointers (pointer), and single-dimensional arrays. Expressions An expression consists of any number of variables, function calls, and constants of any type, joined by operators and parentheses. Thus, the following expressions are valid: 3 + 5 6.7 + 23 Hello + World 5*3 + foobar() When an expression contains values of different types, the two values are first cast to the same type, and then the operator applied. For example in the following expression: 5.7 + 8 The 8 is first cast to a float (8.0), and the two numbers are added (5.7 + 8.0). This becomes slightly more interesting when we use strings. For example: The result is + (5 + 8) 5 is first added to 8, resulting in 13. The 13 is then converted to a string, and appended to The result is resulting in The result is 13.However, The result is + 5 + 8 would result in The result is 58, since the the 5 is first converted to a string, then appended to The result is ... Of course, explicit casting is possible: 56 + (int)7 evaluates to 63. The following operators are provided (in order of precedence (lowest first), with associativity): Operator Assoc Description = right assigns the value of the expression on the right to the variable on the left. || left logical or, returns 0 if false, 1 if true left logical and | left bitwise or ^ left bitwise xor l