2.0 - Key Words Types
- In programming, a keyword is a word that is reserved by a program because the word has a special meaning.
- Keywords can be commands or parameters
- Every programming language has a set of keywords that cannot be used as variable names.
- Keywords are sometimes called reserved names.
- Data Types
- Qualifiers
- Loop
- Storage Class
- Decision
- Jump
- Derived
- User Defined
- Others
- Keywords – Data Types
- char
- The basic data type supported for storing characters of one byte size.
- int
- A simple and efficient type for arithmetic operations
- Usually a word size of the processor although the compiler is free to choose the size.
- ANSI C does not permit an integer, which is less than 16 bits
- float
- ANSI C does not specify any representation
- double
- The implementations may follow IEEE formats to represent floats and
doubles, and double occupies 8-bytes in memory, Supports 0, ∞ (-/+) and
NaN
- signed
- Most Significant Bit (MSB) of the variable decides the sign
- unsigned
- Larger range of positive values within the same available space
- short
- long
NOTE : ANSI C says that the size of short and long
implementation defined, but ensures that the non-decreasing order of
char, short, int, and long is preserved i.e.,
"char ≤ short ≤ int ≤ long"
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