Variables Data types Variable I/O. C introduction. Variables. Variables 1 / 14

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1 C introduction Variables Variables 1 / 14

2 Contents Variables Data types Variable I/O Variables 2 / 14

3 Usage Declaration: t y p e i d e n t i f i e r ; Assignment: i d e n t i f i e r = v a l u e ; Definition (all at once): t y p e i d e n t i f i e r = v a l u e ; Example: i n t number ; / d e c l a r a t i o n / number = 4 2 ; / a s s i g n m e n t / i n t another number = 2 3 ; / d e f i n i t i o n / Variables 3 / 14

4 Saving lines Multiple declarations i n t number, another number ; Multiple Definitions i n t number = 42, anothernumber = 2 3 ; But be careful: i n t a = 23, b = 2 3 ; i n t a, b = 2 3 ; Avoid multiple variable definitions at one line! Variables 4 / 14

5 Valid identifiers Consist of English letters (no ß, ä, ö, ü), numbers and underscore ( ) Start with a letter or underscore Are case sensitive (number differs from Number) Must not be reserved words: auto else long switch break enum register typedef case extern return union char float short unsigned const for signed void continue goto sizeof volatile default if static while do int struct double Style: Stay in one language (English recommended) Decide whether to use camelcaseidentifiers or snake case identifiers. Variables 5 / 14

6 Speaking identifiers 1 / c a l c u l a t e volume o f s q u a r e pyramid / 2 i n t a, b, c ; 3 a = 3 ; 4 b = 2 ; 5 c = (1 / 3) a a b ; 1 / c a l c u l a t e volume o f s q u a r e pyramid / 2 i n t l e n g t h, h e i g h t, volume ; 3 l e n g t h = 3 ; 4 h e i g h t = 2 ; 5 volume = (1 / 3) l e n g t h l e n g t h h e i g h t ; Variables 6 / 14

7 Use speaking identifiers. Please, use speaking identifiers. 1 1 Seriously, use speaking identifiers. Variables 7 / 14

8 Integer numbers Keywords: int, short, long Stored as a binary number with fixed length Can be signed(default) or unsigned Actual size of int, short, long depends on architecture Example (64 Bit): i n t a ; / Range : to / u n s i g n e d s h o r t b ; / Range : 0 to / Variables 8 / 14

9 Floating point numbers Keywords: float, double, long double Stored as specified in IEEE 754 Standard TL;DR Special values for,, NaN Useful for fractions and very large numbers Type a decimal point instead of a comma! Example: f l o a t x = ; / P r e c i s i o n : 7 to 8 d i g i t s / d o u b l e y = ; / P r e c i s i o n : 15 to 16 d i g i t s / Variables 9 / 14

10 Characters Keyword: char Can be signed(default) or unsigned Size: 1 Byte (8 Bit) on almost every architecture Intended to represent a single character Stores its ASCII number (e.g. A 65) You can define a char either by its ASCII number or by its symbol: c h a r a = 6 5 ; c h a r b = A ; / use s i n g l e q u o t a t i o n marks / Variables 10 / 14

11 printf() with placeholders The string you pass to printf may contain placeholders: i n t a = 3 ; i n t b = 5 ; f l o a t c = 7. 4 ; p r i n t f ( a : %d\n, a ) ; p r i n t f ( b : %d\ nc : %f \n, b, c ) ; Output: a : 3 b : 5 c : 7. 4 You can insert any amount of placeholders. For each placeholder, you have to pass a value of the corresponding type. Variables 11 / 14

12 Example placeholders The placeholder determines how the value is interpreted. To avoid compiler warnings, only use the following combinations: type description type of argument %c single character char, int (if <= 255) %d decimal number char, int %u unsigned decimal number unsigned char, unsigned int %X hexadecimal number char, int %ld long decimal number long %f floating point number float, double Variables 12 / 14

13 Variable input scanf() is another useful function from the standard library. Like printf(), it is declared in stdio.h Like printf(), it has a format string with placeholders You can use it to read values of primitive datatypes from the command line Example: i n t i ; s c a n f ( %d, &i ) ; After calling scanf(), the program waits for the user to input a value in the command line. After pressing the return key, that value is stored in i. Variables 13 / 14

14 Note: scanf() uses the same placeholders as printf() You must type an & before each variable identifier (more about this later) If you read a number (using %d, %u etc.), interpretation Starts at first digit Ends before last non digit character If you use %c, the first character of the user input is interpreted (this may be a as well!) Never trust the user: they may enter a blank line while you expect a number, which means your input variable is still undefined! Variables 14 / 14

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