Answer / vadivel t

Though, macro has advantages... it hav few disadvantages
too...
------------------------------------------------------------
1.1st disadvantage is, In debugging time u can't see the
value of the macro assigned to it.

So, u have to have ur source file, to fine out the value of
the macro.

But nowadays there are some debuggers which are capable of
showing the value of macro in debugging time.
------------------------------------------------------------
2.Dont use macro for typedef or be cautious before use.

Ex:
lets say, u wanted to have a macro, which can be used to
represent a declaration to an int pointer

#define INTPTR int*

in main..
main()
{
INTPTR a, p;
/*here, our understanding will be 'a' and 'p' both are int
pointers*/
}

but in preprocessor time macro shall be replaced like this -
> int* a, p;
so only 'a' will be treated as int pointer and 'p' shall a
normal int variable.

So tyr to avoid using MACRO for typedef.
use -> typedef int* INTPTR, So that u can achieve desired
result.
------------------------------------------------------------
3.Be carefull while using macro in arithmatic operation.

Ex:

#define MUL(a,b) a*b

In main...
main()
{
int a = 3, b = 4;
....
....
.....
printf("%d", MUL(a+1, b+1));
/*Here u may expect the result 4 * 5 = 20 but the result
would be 8*/
}

lets analise,
in preprocessing time macro shall be replaced as below;

MUL(a+1, b+1) - > 3+1*4+1, so result would be 8.

To avoid the unexpected result.
Define macro lik ...

#define MUL(a,b) (a)*(b)
------------------------------------------------------------

c program to compute AREA under integral

0 Answers   Infosys,

---

write a c program to add two integer numbers without using arithmetic operator +

13 Answers   Value Labs,

---

How would you sort a linked list?

1 Answers  

---

write a progrmm in c language take user interface generate table using for loop?

0 Answers  

---

what is the use of getch() function in C program.. difference b/w getch() and getche()??

29 Answers   HCL, IBM, Infosys, TCS, Wipro,

---

---

main() { int x=20,y=35; x = y++ + x++; y = ++y + ++x; printf("%d %d\n",x,y); }

27 Answers   Advent Global Solutions, CitiGroup, Valeo Lighting Systems India Private Limited, Vishal Transformers, Wipro, Zencer,

---

What are the types of c language?

0 Answers  

---

WRITE A C PROGRAM TO FIND SECOND BIGGEST VALUE FROM THE GIVEN VALUES

1 Answers  

---

Can you write the function prototype, definition and mention the other requirements.

0 Answers   Adobe,

---

What is masking?

0 Answers  

---

write a program to convert a expression in polish notation(postfix) to inline(normal) something like make 723+* (2+3) x 7 (not sure) just check out its mainly printing expression in postfix form to infix.

0 Answers   Subex,

---

what will the following program do? void main() { int i; char a[]="String"; char *p="New Sring"; char *Temp; Temp=a; a=malloc(strlen(p) + 1); strcpy(a,p); //Line no:9// p = malloc(strlen(Temp) + 1); strcpy(p,Temp); printf("(%s, %s)",a,p); free(p); free(a); } //Line no 15// a) Swap contents of p & a and print:(New string, string) b) Generate compilation error in line number 8 c) Generate compilation error in line number 5 d) Generate compilation error in line number 7 e) Generate compilation error in line number 1

1 Answers   IBM,

---