Download PDF by Keith Weiskamp: Advanced Programming with Microsoft Quickc

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Additional resources for Advanced Programming with Microsoft Quickc

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Let's look at a quick example to see how this feature is used. c and run it through the QuickC preprocessor: #defineMIN(a,b) #defineMAX(a,b) #def i n e MAXVAL 100 32 ( (a) < (b) ) ? (a) : (b) ( (a) > (b) ) ? (a) : (b) 2 · QuickC Programming Techniques xnain() { int i,j; #if MAXVAL > 100 printf ("\nMax value out of range—exiting program") ; exit(l); #else printf ("\nNumber comparison program") ; #endif printf ("\nlnput two numbers less than 100 : ") ; scanf("%d%d",&i,&j); if ( (i >= MAXVAL) | | ( j >= MAXVAL) ) printf ("\nNumber is greater than %d", MAXVAL) ; else { printf ("\nThe smallest number is %d", MIN(i, j) ) ; printf ("\nThe largest number is %d", MAX(i, j) ) ; #undef MAXVAL #define MAXVAL 200 printf ("\nBoth numbers are less than %d", MAXVAL) ; } } In this case, note that the source file contains the #define, #if, ttelse, #endif, and #wftute/directives.

This process is demonstrated in the following function: #def ine INC (x) x++ #def ine MAXTRY 3 int readpass(char *name) /* readpass gets a pass word from the user and tests the password. */ { int tries = 0; char pass [20]; while (tries < MAXTRY) { printf ("Enter your password %s : ") ; gets(pass); if (checkpass(name,pass)) return 1; INC(tries); } print f ("\nSorry %s, you don't know your password") ; return 0; } #undef INC (x) #define INC(x,y) x= x +y Before this function starts, the macros INC and MAXTRY are defined.

3. Note that two of the fields of this structure, name and product, are pointers. If data is assigned to these fields, memory must also be allocated to store the data. To illustrate this point, let's write a function, make cust, to create a structure and store data in the structure. 3. Allocating memory for a structure in the heap s t r u c t cust * makecust (char *cname, char *cprod, i n t cage, i n t cno) { s t r u c t cust *ptrcust; p t r c u s t = ( s t r u c t cust *) m a l l o c ( s i z e o f ( s t r u c t c u s t ) ) ; i f (ptrcust == NULL) return NULL; / * c r e a t e storage for name */ i f ( (ptrcust->name = malloc ( s t r l e n (cname) ) ) == NULL) return NULL; / * c r e a t e storage for product */ i f ( (ptrcust->product = malloc ( s t r l e n (cprod) ) ) == NULL) return NULL; strcpy(ptrcust->name,cname); strcpy(ptrcust->product,cprod); ptrcust->age = cage; ptrcust->no = cno; return p t r c u s t ; } Here the arguments cname, cprod, cage, and cno, contain the data we wish to store in the structure.

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