### Basic geometry: Manual for teachers by George David Birkhoff, Ralph Beatley

• April 2, 2017
• Introductory Beginning
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By George David Birkhoff, Ralph Beatley

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Smiling space) has ASCII 1. Data Types – C language is rich in data types. There are 4 classes of data types: 1. 2. 3. 4. Primary data types (int, float, char) User defined data types (enumerator, typedef) Derived data types (array, function, pointers, structure, union) Empty data sets. 1e+4932 Formula to calculate range - 2n-1 Where n is the number of bits occupied by the data type. e. 16 bits ( since 1 byte is equal to 8 bits) So, 216-1 = 215 = 32768. Thus range becomes: Note- -32768 to +32767 This formula cannot be used to calculate the range of real data types (float, double, long double) Modifiers used with primitive data types Signed, unsigned, and short may be applied to character and integer primitive data types.

You can use letters, digits and underscore _ character to make your variable names. Variable names can be up to 31 characters in ANSI C language. Valid Names Only letters, digits and the underscore character may be validly used in variable names. The first character of a variable may be a letter or an underscore, although The Standard says to avoid the use of underscores as the first letter. Thus the variable names “temp_in_celsius”, “index32” and “sine_value” are allvalid, while “32index”, “temp-in-celsius” and “sine\$value” are not.

There are three types of integers: decimal, octal, hexadecimal. Decimal numbers contain set of digits 0 to 9 which can be positive (+) or negative (-). : 6, 46, 398, 658736, -89, +598 are all integers Spaces, comma or special symbols are not allowed. : 12 897, 364,897, \$56, 78@56 are all invalid or wrong numbers. Octal numbers consist of any combination of digits fro 0 to 7, with a leading 0. :037, 0435, 0551. Hexadecimal numbers has 16 digits 0 to 9 and alphabets A to F (10-15), the sequence of digits is preceded by 0x or 0X.