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Can the sizeof operator be used to tell the size of an array passed to a function?
No. There’s no way to tell, at runtime, how many elements are in an array parameter just by looking at the array parameter itself. Remember, passing an array to a function is exactly the same as passing a pointer to the first element.
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Why n++ executes faster than n+1?
The expression n++ requires a single machine instruction such as INR to carry out the increment operation whereas, n+1 requires more instructions to carry out this operation.
kbjarnason
- Jul 2nd, 2010
If n++ executes faster than n = n + 1, the reason for it is simple: your compiler has a poor optimizer.
romainn
- Jun 14th, 2007
N++ takes more than one instruction, ++n is faster. n++ has to store n, increment the variable and return n, while ++n increment n and return without storing the previous value of n.
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What are the advantages of auto variables?
1)The same auto variable name can be used in different blocks2)There is no side effect by changing the values in the blocks3)The memory is economically used 4)Auto variables have inherent protection because of local scope
plan_with.me
- Jan 27th, 2008
The main advantage of auto variable is if we use auto variable in different block of our code with different value then it has not any sideeffect because it is automatically managed by the compiler .
vinod
- Feb 22nd, 2007
Auto variable have initial value as garbage.auto int and int are one and the same.
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Diffence arrays and pointers?
Ø Pointers are used to manipulate data using the address. Pointers use * operator to access the data pointed to by themØ Arrays use subscripted variables to access and manipulate data.Array variables can be equivalently written using pointer expression.
stshekhar
- Jun 9th, 2008
Arrays are constant pointer . that is we can not point array variable to another location but we can modifies the content of the array elemnt.Pointers can be pointed to any address of same type.(Untill it does not declare const explicitly).
Bobby
- Sep 14th, 2006
It is important when ever anyone asks uArray elements are always stored in contiguous memory locations.If they increment then they points to next of that array type ..But when a pointer incremented always points to the immediately next location of its typeBye,Prabhu
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What are the arithmetic operations that can be performed on pointers?
thulasi
- Apr 30th, 2007
The arithmetic operations that can be performed using pointers is of three.... one is for addition, subtraction and division....these are the 3 operations that are used by pointers...there is no, division and modulus operation.....
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What is the difference between the function pointer and pointer to a function
Robert
- May 8th, 2007
Pointers to functions concept is used in C programming language in various instances. One of the common instance in which programmers use pointers to function concept is for passing pointers to a func...
sripri
- May 8th, 2007
Function pointers are actually pointers. The address of a function gets pointed to by function pointer.Example of defining a function pointer is as below:int (*exforsys)(int,float)= NULL;
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What is structure padding?where it is used in real time applications?
fcawad_03
- Feb 21st, 2007
I understand that some compilers pad some bytes to the aggregate data types in order to access the members of the aggregate data types(i.e. structure) fast. This depends on the architectures. Some arc...
rr
- Feb 20th, 2007
Those are 3 different things.Structure PaddingMost processors require specific memory alignment on variables certain types. Normally the minimum alignment is the size of the basic type in question, fo...
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printf("Address of j=%un",&j);
printf("Address of k=%un",&k);
return 0;
}
Suppose the answer is:
Address of i=2004
Address of j=2002
Address of k=2000
why is the address decreasing ?">Consider the following program:#includemain(){int i=3;int *j;int **k;j=&i;k=&j;printf("Address of i=%un",&i);printf("Address of j=%un",&j);printf("Address of k=%un",&k);return 0;}Suppose the answer is:Address of i=2004Address of j=2002Address of k=2000why is the address decreasing ?
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Write a program to check if the number is palindrome or not using recursive function.
md faiz iqbal faiz
- Jan 15th, 2010
main{ int sum = 0,n,n1,r; printf(" enter the number to be tested for palimdromen" ); scan("%d",&n); n1=n; while(r!=0) {r=n%...
baseersd
- Jul 24th, 2007
Here is the code for palindrome with recursive mechanism#include<stdio.h>int rev=0; //Global Variableint REV(int num){if(num>0){ rev=(rev*10)+ (num %10); REV(num / 10); //calli...
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What is meant by "contagious memory allocation"?
bairaviuthra
- Jun 19th, 2007
Contiguous memory is meant by continuous memory space in the available memory. so when we allocate a memory space contigously in our programming it is reffered to as contiguous memory allocation.
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What is heap memory that is used to store global & static variables of C.
bismitapadhy
- Feb 16th, 2008
Global and static variable are stored in data segment.heap memory used for dynamic memory allocation.
Vishwas.p
- Feb 8th, 2008
Data - int char[]="hello".......constants not intiliazed to zero. BSS( Block started by symbol) - static int i....... all global and static variables stack - variables,...
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puts (wer):
1. prints the string 8 8 8
2. prints the null string
3. prints the string m, n, b
4. none of these
">The following program fragment int m=n=b=8; char wer[80]; sprintf(wer, "%d%d%d", m, n, b,); puts (wer): 1. prints the string 8 8 8 2. prints the null string 3. prints the string m, n, b 4. none of these
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What is true about the following C FunctionsA. Need not return any valueB. Should always return an integerC. Should always return a floatD. Should always return more than one value
laxmikanth
- Feb 10th, 2006
though the default scope is integer there is no compulsion that we should return an integer and we know that a void function can't return a value by using return statement.at the same time a void func...
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">Vi) main(){ extern int i; i=20;printf("%d",i);}
Linker Error : Undefined symbol '_i'Explanation: extern storage class in the following declaration, extern int i;specifies to the compiler that the memory for i is allocated in some other program and that address will be given to the current program at the time of linking. But linker finds that no other variable of name i is available in any other program with...
ashoksurati
- Apr 11th, 2008
Extern is a kind of variable declaration,if we declare a variable as extern it can be accessable anywhere in the program.the accessing of the variable is doesn't depends on the scope.TahnkUAshok
pavan.mustyala
- Apr 11th, 2008
Extern is a key word in C that indicates the scope of a variable or function.This key word can be used with a variable when it is used across different files of a typical project.The variable is ...
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">Main(){ int x=5; clrscr(); for(;x==0;x--) { printf("x=%dn”", x--); }}
A) none of the aboveB) 0, 1, 2, 3, 4C) 1, 2, 3, 4, 5D) 4, 3, 2, 1, 0Explanation: prints nothing, as condition x==0 is False
dasam
- Mar 30th, 2007
It printfs nothing .. since the condition x==0 never satisfies and the for loop never executes :)
C Interview Questions
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