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How to Design Programs Languages phần 7

Mục đích: để tính toán các divisior chung lớn nhất IMAG phần: (num thực) Mục đích: để trích xuất một phần tưởng tượng từ một số phức tạp không chính xác, chính xác: (num num) Mục đích: đó là số lượng gần đúng không chính xác bởi một không chính xác chính xác? : (Num-boolean) | current-seconds - int Purpose to compute the current time in seconds elapsed since a platform-specific starting date denominator rat - int Purpose to compute the denominator of a rational e real Purpose Euler s number even integer - boolean Purpose to determine if some value is even or not exact- inexact num - num Purpose to convert an exact number to an inexact one exact num - boolean Purpose to determine whether some number is exact exp num - num Purpose to compute e raised to a number expt num num - num Purpose to compute the power of the first to the second number floor real - int Purpose to determine the closest integer below a real number gcd int int . - int 104 Purpose to compute the greatest common divisior imag-part num - real Purpose to extract the imaginary part from a complex number inexact- exact num - num Purpose to approximate an inexact number by an exact one inexact num - boolean Purpose to determine whether some number is inexact integer- char int - char Purpose to lookup the character that corresponds to the given integer in the ASCII table if any integer any - boolean Purpose to determine whether some value is an integer exact or inexact lcm int int . - int Purpose to compute the least common multiple of two integers log num - num Purpose to compute the base-e logarithm of a number magnitude num - real Purpose to determine the magnitude of a complex number make-polar real real - num Purpose to create a complex from a magnitude and angle 105 max real real . - real Purpose to determine the largest number min real real . - real Purpose to determine the smallest number modulo int int - int Purpose to compute first number modulo second number negative number - boolean Purpose to determine if some value is strictly smaller than zero number- string num - string Purpose to convert a number to a string number any - boolean Purpose to determine whether some value is a number numerator rat - int Purpose to compute the numerator of a rational odd integer -