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FLOATING-POINT NUMBERS

Floating-point variables are declared using the 'float' type specifier, and floating point constants are indicated by a decimal point:

    float    standard_deviation;
    standard_deviation = 0.;

Double-precision floating-point variables use the 'double' specifier, usually occuping 64 bits instead of a float's 32 bits.  Floating-point constants are double by default.  In Think C, arithmetic using doubles is faster that that using float variables.  

An alternate representation of floating-point constants uses "e" notation to indicate the number is to be multiplied by 10 raised to the indicated exponent:

    standard_deviation = 1e-4;     /*  same as .0001  */

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