UMBC CMSC 201 Fall '06 CSEE | 201 | 201 F'06 | lectures | news | help |

/************************************************\ * Filename: fraction.h * * Author: Sue Bogar * * Section: 201staff * * email: bogar@cs.umbc.edu * * Date Written: 4/14/98 * * Last Modified: 11/20/05 * * * * Description: This header file contains the * * structure definition for a fraction type * * called FRACTION, and the function prototypes * * for the functions defined in fraction.c, the * * implementation of the ADT fraction. * \************************************************/ #ifndef _fraction_h #define _fraction_h /***************** * The fraction ADT is implemented as a structure * that has three members, all of type int. * The first member is the whole number part, * the second member is the numerator and the * last member is the denominator. *****************/ typedef struct fraction { int whole; int numerator; int denominator; } FRACTION; typedef FRACTION* FRACTPTR; /****************** * Name: AddFractions * Usage: AddFractions (&f1, &f2, & sum); * Input: three arguments of type FRACTPTR * Output: nothing is returned, however sum is modified * * AddFractions takes three arguments of type FRACTPTR, * adds the FRACTIONs pointed to by the first two FRACTPTRs, * and modifies the FRACTION pointed to by the last FRACTPTR, * to hold their sum, which has been reduced to lowest terms. ******************/ void AddFractions (FRACTPTR fPtr1, FRACTPTR fPtr2, FRACTPTR sumPtr); /****************** * Name: SubFractions * Usage: SubFractions (&f1, &f2, &difference); * Inputs: three arguments of type FRACTPTR, where the * first argument points to the minuend and the * second argument points to the subtrahend * Output: nothing is returned, however difference is modified * * SubFractions takes three arguments of type FRACTPTR, * subtracts the second FRACTION (pointed to by fPtr2) from the * first FRACTION (pointed to by fPtr1). The difference, f1 - f2 is * calculated, reduced to lowest terms, and stored in the FRACTION * pointed to by the last FRACTPTR differencePtr. * ******************/ void SubFractions (FRACTPTR fPtr1, FRACTPTR fPtr2, FRACTPTR differencePtr); /****************** * Name: MultFractions * Usage: MultFractions (&f1, &f2, &product); * Input: three arguments of type FRACTPTR * Output: nothing is returned, however product is modified * * MultFractions takes three arguments of type FRACTPTR, * multiplies the FRACTIONs pointed to by the first two FRACTPTRs, * and modifies the FRACTION pointed to by the last FRACTPTR, to * hold their product, which has been reduced to lowest terms. ******************/ void MultFractions (FRACTPTR fPtr1, FRACTPTR fPtr2, FRACTPTR productPtr); /****************** * Name: DivFractions * Usage: DivFractions (&f1, &f2, "ient); * Input: three arguments of type FRACTPTR * Output: nothing is returned, however quotient is modified * * DivFractions takes three arguments of type FRACTPTR, * divides the FRACTION pointed to by the first FRACTPTR by the * FRACTION pointed to by the second FRACPTR, and modifies the * FRACTION pointed to by the last FRACTPTR, to hold the quotient, * which has been reduced to lowest terms. ******************/ void DivFractions (FRACTPTR fPtr1, FRACTPTR fPtr2, FRACTPTR quotientPtr); /****************** * Name: RedToLowTerms * Usage: RedToLowTerms (&f); * Input: the address of a FRACTION variable which is * is to be reduced to lowest terms * Output: none, but the FRACTION which is passed in * by reference will be modified to be in * lowest terms. * * RedToLowTerms takes one argument of type FRACTPTR and * reduces that fraction to lowest terms by finding the * greatest common divisor of the numerator and denominator * and dividing through by that value. ******************/ void RedToLowTerms (FRACTPTR fPtr); /****************** * Name: InitFraction * Usage: InitFraction (&f); * Input: the address of a FRACTION variable which is * to be initialized. * Output: none, but the FRACTION which is passed in * by reference will be modified to have the * value 0. * * InitFraction takes one argument of type FRACTPTR * and initializes its members to: * whole = 0, numerator = 0, denominator = 1 * denominator is set to 1 because division * by 0 is undefined. ******************/ void InitFraction (FRACTPTR fPtr); /****************** * Name: AssignFraction * Usage: AssignFraction (&f, whole, num, denom); * Input: the address of a fraction variable, the whole * number, the numerator and the denominator to * be assigned. * Output: none, but the variable whose address was passed * to the function will be modified to hold the * whole number, numerator and denominator passed in. * * AssignFraction takes one argument of type FRACTPTR* * and three arguments of type int, which are whole, num * and denom. The members of the FRACTION struct are then * assigned these values. ******************/ void AssignFraction (FRACTPTR fPtr, int whole, int num, int denom); /****************** * Name: PrintFraction * Usage: PrintFraction (&f); * Input: One argument of type FRACTPTR * Output: None, but the fraction whose address is passed in * will be printed * * PrintFraction takes one argument of type FRACTPTR * and prints the fraction it points to in this format: * whole numerator/denominator * Example: 1 1/4 ******************/ void PrintFraction (FRACTPTR fPtr); /****************** * Name: GCD * Usage: gcd = GCD (num1, num2); * Input: two integer agrguments * Output: the greatest common divisor of the * two integers passed in, type int * * GCD takes two integer arguments and calculates * the greatest common divisor of the those numbers * using Euclid's GCD algorithm. It returns the * result, which is an int. ******************/ int GCD (int a, int b); #endif

CSEE | 201 | 201 F'06 | lectures | news | help