Answer / vignesh1988i

malloc is briefly termed as Memory ALLOCation ......
whenever we write a program in C we will declare some
variables or arrays for a size more than whatever we need ,
etc etc..... so some variables are getting used correctly
and in arrays only some of the memory spaces are getting
used because the user dont know how much spaces he is gonna
use.......so here some memory is getting wasted without
using it.... so there comes a concept called DYNAMIC MEMORY
ALLOCATION in C...

we will give the values for how much memory we need at the
run time of the program... but this concept also only 85%
efficient... this has three types :
1)malloc();
2)calloc();
3)realloc();
malloc() is a function present in ALLOC.H standard library
which is used to allocate memory at run time (ie) in single
or in blocks.....

the syntax is :
pointer_variable=(typecasting
datatype*)malloc(sizeof(datatype));

this pointer variable should be of same datatype as the
typecasting datatype........

thank u

Answer / ravi chandra

malloc function is used to allocate some space in memory for
the current program that we are running.
malloc() function actually return s the value of the address
of the memory in the memory segment
c=malloc();
it gives the address to the variable c.


h=malloc(sizeof(struct node));
it returns the address of structure for the variable h;
some h=1000; (address value)

Answer / raghavan

Every process has a address boundary. When a process does a malloc, memory is allocated from this boundary location and the process address boundary is moved to the new end. In linux, there is a function sbrk() that allows to change the process address boundary. sbrk(0) will return the current process address boundary and sbrk(n) will move the process boundary by n bytes.
malloc internally uses this feature to allocate memory for the requesting process.

Answer / srinath, hyd

ya. this is an memory allocation porpose.
some other allocations are there calloc(), alloc()

hw can we delete an internal node of binary search tree the internal node has child node..plz write progarm

0 Answers   TCS,

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When you call malloc() to allocate memory for a local pointer, do you have to explicitly free() it?

2 Answers   Aloha Technology,

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what is the first address that gets stored in stack according to a C or C++ compiler???? or what will be the first address that gets stored when we write a C source code????????

2 Answers   Apple,

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i have a written test for microland please give me test pattern

0 Answers   Microland,

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1234554321 1234 4321 123 321 12 21 1 1 12 21 123 321 1234 4321 1234554321

0 Answers  

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what is difference between declaring the pointer as int and char in c language?

3 Answers  

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Diff between for loop and while loop?

2 Answers   TCS,

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What is the difference between union and anonymous union?

0 Answers   Hexaware,

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find the value of y y = 1.5x+3 for x<=2 y = 2x+5 for x>2

0 Answers   TCS,

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main() { FILE *fs; char c[10]; fs = fopen(“source.txt”, ”r”); /* source.txt exists and contains “Vector Institute” */ fseek(fs,0,SEEK_END); fseek(fs,-3L,SEEK_CUR); fgets(c,5,fs); puts(c); }

1 Answers   Vector,

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DIFFERNCE BETWEEN THE C++ AND C LANGUAGE?

2 Answers   Wipro,

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#include<stdio.h> #include<conio.h> void main() {clrscr(); char another='y'; int num; for(;another=='y';) { printf("Enter a number"); scanf("%d",&num); printf("squre of %d is %d",num,num*num); printf("\nwant to enter another number y/n"); scanf("%c",&another); } getch(); } the above code runs only one time.on entering 'y' the screen disappeares.what can i do?

3 Answers  

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