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07-C-DataTypes - ECE 175 Computer Programming for...

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ECE 175: Computer Programming for Engineering Applications Simple Data Types
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ECE 175: Computer Programming for Engineering Applications - Simple Data Types Numeric types Why can't we use double for all numeric variables? Why use short int, int, etc.? Because integer operations are faster than double operations Integer data types require lesser storage space than double Integer operations are always precise, double leads to round-o ff errors Number representation Represented as binary string (sequence of 0s and 1s) Binary representation of integers and double are di ff erent Integer is stored as a simple binary string Double is stored in two parts: Mantissa and Exponent real number = mantissa x 2 exponent 2 binary number type int format mantissa type double format exponent
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ECE 175: Computer Programming for Engineering Applications - Simple Data Types Numeric range In our gcc, int is same as long int 3 Type Range in Bytes short -32768 to 32767 2 unsigned short 0 to 65,535 2 int -2147483648 to 2147483647 4 unsigned int 0 to 4294967295 4 long -2147483648 to 2147483647 4
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