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What is the difference between typedef & Macros?
manoj yadav
- Feb 14th, 2015
1>The typedef is limited to giving symbolic names to types only where as #define can be used to define alias for values as well, like you can define 1 as ONE etc. 2>The typedef interpretation is perf...
kbjarnason
- Jul 2nd, 2010
typedef defines a new type, in terms of existing types. Macros are simply text replacements.As an example of the difference, try the following:#include <stdio.h>typedef char * ptr;#define ...
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}">
What will be the output of the code?#includemain(){int a=10;int b;b=a++ + 20;printf("a= %d b= %d", a, b);}
The o/p will be 11 30. Can somebody tell me how?
jintojos
- Jul 2nd, 2008
The variable a is incremented by one only after completing the statement b=a++ + 20;So after executing the statement b=a++ + 20 the variable b will have the value 30.Then the value of variable a is incremented that is why the out put is 11 30.
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Write a program in C to find the 3*3 matrix multiplication
Neha
- Mar 26th, 2018
Q~Program to perform matrix multiplication of 3?3 using strassens algorithm. Calculate total number of addition and multiplication operation while computing the matrix multiplication
Subhanjan Basu
- Apr 10th, 2012
Check this out:
Code- span style="color: #ff0000;">"enter the elements in A matrix:
- ""%d""enter b matrix:
- ""%d""
- ""multiplication matrix is:
- ""%d ""
- ");
- }
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Write a program to find distinct word from a file
Write a program to find distinct word from file,and to check a particular word present or not in each line
stevenong2007
- Feb 20th, 2008
Here is how I would write this in C++.....Enjoy// // File: FindWordCPP.cc// Author: Steven Ong//// Created on February 19, 2008, 11:05 PM//#include <stdlib.h>#include <iostream>...
stevenong2007
- Feb 19th, 2008
The statements: if(c == 'r') ... should be .... if(c =='r')...And if(c == 'n') ... should be .... if(c =='n')For ...
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Sum 0f 2 64 bits using 32 bits
Hi,the question is you have cpu that knows to docomputations on 32 bits(unsigned integer).write a function that find the sum of 2 64 bits numbers using this cpu?there is a struct:typedef struct{ int low;(32 bits) int high;(32 bits)}64bit;
devendra
- Aug 17th, 2011
well this can be done in any number of ways... One simple way is to use asm keyword and write assembly instructions if you are familiar with assembly language.. Because through assembly language we ca...
amodiahs
- Jul 24th, 2008
Hello friends, Here we need to use a linked list. See, it is already known that CPU doesnot support one single 64bit number hence, first thing is that using normal data types will be useless. So here ...
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strncpy() & memcpy() function in C
what is the difference between strncpy()(not strcpy) & memcpy() function in C?
jca_dips
- Jul 18th, 2008
strncpy copies upto null or specified no. of bytes, whichever is less. But memcpy overlooks null, and copies all specified no. of bytes. None of them adds null in destination string by itsel...
janhavibend
- Jul 14th, 2008
When I checked with strncpy and memcpy both are not terminating string with '' after copying when dst size is less than src size. otherwise both will terminate dst string with '' when sizeof(dst) >= sizeof(src)
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Field Width Specification
What is Field Width Specification?
jbode
- Jul 6th, 2010
I'm assuming this is the minimum field width in a conversion specification for printf(), which specifies the minimum number of characters written to the output stream for that conversion. For ex...
kbjarnason
- Jul 1st, 2010
Presumably the question is about the width specifier on bit-fields:int x : 7;In this case, the width specifier (7 in our example) tells the compiler that the bit-field (x) will use 7 bits, rather than...
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BSS Segment
What is BSS segment? Where it will be?
laxmii.s
- Aug 21st, 2008
BSS:Block Started by Symbol. It is in memory?segment. While executing the program all Uninitialized global and static variables are placed in this BSS Segment??????
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Printf() and printf as a variable
Can printf be used as a variable as well as a procedure?
sarav957
- Jul 10th, 2009
We can use printf as a variable and it is compiling GCC compiler This is my program which is having runtime and compiled successfully without any warning #include<stdio.h> int main( ) { ...
Jaya_Kaja
- Jul 18th, 2008
printf can be used as a variable . But once we declare a variable printf ,standard Library function "printf" can not be recongnized by the compiler within the sc...
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What do you mean by critical section in c?
rashmi.mohanty
- Sep 9th, 2008
critical section in c ,is a piece of code that accesses a shared resource (data structure or device) that must not be concurrently accessed by more than one thread/process of execution.eg :- whil...
deshdeepak53
- Jul 17th, 2008
Critical section is the part of the code that can be assessed by multiple threads or processes at the same time.
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Memory Allocation
we say stack is allocated to the local variables ,formal arguments and return addresses of a function for manipulating function calls?but the question arises when does the stack allocation to above things take place?at compile time or run time.And by the way what about automatic memory allocation.what is it?
kbjarnason
- Jul 1st, 2010
C neither requires nor defines a stack; at most it requires, in some cases, behaviour which is stack-like, but could be provided by any number of means.As to when the allocation is done, again, this i...
coolquasar
- Sep 15th, 2008
Memory is allocated only during the runtime, and compiler just decides the amount of memory needed by each variable... It just adds the displacement value to be added to the Base Stack pointer for "Local Variables" Allocation.
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Display different combinations of some letters forming a word
w.a.p in C to input a word. find the total no. of letters forming the word. and using these letters display the total no. of possible combinations without repeating any letter.for example: if string entered is "sunil", the total no. of letters in the word is 5 i.e. s,u,n,i,l.and then displays sunil sunli...
kamal Bhatia
- Feb 13th, 2015
Code- #include<stdio.h>
- #include<string.h>
- #define a 15
- "Enter a word");
- scanf("%s""%d ""%c""
- "
ishan786
- Feb 15th, 2009
#include<stdio.h> #include<conio.h> char a[10]; int i,j,k; void one(); void two(); void three(); void main() { printf("n enter a word "); &nb...
String Concatination
How to concatenate the two string without using the predefined functions (such as strcat and strlen)?
vbablu
- Jul 2nd, 2009
void main() { char s[20]; int i,n;????????????????????????????? printf("enter a string");??????????????????????????????? scanf("%s",s);????????????????????????????? for(i=0;s[i]!='';i++)??????????????...
BSS Data Segment
What is a bss data segment?
sudheer .T
- Aug 7th, 2011
BSS (Block started by symbol), a part of Data Segment store all variables initialized to 0. static variable(initialized with value other than 0) are not stored in BSS.
Actually BSS is an "Uninitialized RAM" which is initialized to 0 before executing main().alokag
- Jun 25th, 2009
BSS, a part of Data Segment store all variables initialized to 0. static variable(initialized with value other than?0) are not?stored in BSS.Actually BSS is an "Uninitialized RAM" which is initialized to 0 before executing main().
Reallocating memory
When reallocating memory if any other pointers point into same piece of memory do you have to readjust these pointers or do they get readjusted automatically?
abhimanipal
- Jul 4th, 2009
If any pointers are pointing to the old memory location they have to be adjusted. C won't do it for you
alokag
- Jun 25th, 2009
While reallocating, there is no readjustments. The OS will just search for the required memory block(not in use) & if available pass its pointer to the user.Nb: It CAN be the same pointer you have before reallocation.
Efficient Sorting Method
If we add a element to the last of a sorted sequence. Then which of the sorting method will be most efficient to sort the new sequence?
netsim
- Jul 9th, 2010
It depends on the date struct to store the sequence.The answer for array or linked list will be different.
akhil kumar jha
- Feb 28th, 2010
I think radix sorting would be more perfect in case of large sequence of elements as because it will reduce the no. of elements to be compared to a minimal. As it goes on to check the inserted el...
Big Endian Little Endian
How will you find if a machine is a big endian or little endian?
mohamr2
- Sep 20th, 2010
The usual techniques are to use a pointer: int x = 1; if(*(char *)&x == 1) printf("little-endiann"); else printf("big-endiann"); or a union: union { int i; ...
poojarinke
- Aug 13th, 2010
Some machines store, for example, a two-byte integer with the least significant byte first, followed by the most significant byte. These machines are called little endian machines. Other machines sto...
Pointer Disadvantages
What are the disadvantages of using pointer in C?
Satarupa Panda
- Nov 17th, 2011
If sufficient memory is not available during runtime for the storage of pointers, the program may crash.
jbode
- Feb 2nd, 2011
In general, there's no good way to know if a non-NULL pointer value is valid and refers to an area of memory that's safe to access and/or modify.There's no way to determine from the pointe...
Count Negative Elements
A list of number is given. Make a program which counts the no of negative elements using array inc.
Faster Statement Execute
Which one will execute faster if(flag==0) or if (0==flag) and why?
ridercoder
- Dec 25th, 2010
It all depends on what assembly code the compiler generates. Essentially, do "0 == flag" and "flag == 0" compile down to the same code, or not?
jbode
- Nov 19th, 2010
Both gcc and Visual Studio generated the exact same machine code for both forms (as well as for !flag), so neither version would be faster than the other for platforms using those compilers.? Frankly, I'd be surprised if any compiler generated different code for the two forms.?
Ans