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In c the return value for main() is optional why in c++ the main() must return value ?
jbode
- Feb 1st, 2011
From the C standard:------------------------------5.1.2.2.1 Program Startup1 The function called at program startup is named main. The implementation declares no prototype for this function.&nbs...
abcdef
- Dec 19th, 2006
In c every function by default returns an integer value. By using void we mean a value zero is return to the environment i.e., operating system.
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Is it possible to declare a dynamic array without using malloc,calloc,and pointer.
jbode
- Feb 1st, 2011
C99 introduced the concept of a Variable Length Array (VLA), where the array size doesn't have to be known until runtime:size_t elements=10;int arr[elements];They act pretty much like regular, sta...
Deepam
- Jan 3rd, 2007
No ,its not possible to have a dynamic array without using calloc,malloc or without ptr.... Why u want to know abt it? but u can achieve a array without specifying size say arr[]; but its not eff...
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Why C does not support nested functions?
17shraddha
- Nov 1st, 2010
C does not support nested function try this code void adds(){?? ? printf("Adds start");???? void subbs()???? {???? printf("subbs start");???? }???? printf("adds end");}void main(){?? adds();?? subs();//Will generate an error prototype required}
uharish38
- Jul 8th, 2009
In C every funciton is independant from other.And there is a clear difference from function definition and function invocation.In C the only way to Invoke a function is to call a function.
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How we increment a value without using operator'+'.q2?what is single tone class. thanks
Hemendra Jain
- Mar 27th, 2007
Consider data is in HEX. Right shift the data till 0 is encountered AND increment the count. The position where 0 is encountered , change it to 1 and all bits to 0 for all ...
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Q. Write a function(efficient) to find the next prime number after a given number ?
Vishal Bharadwaj
- Aug 31st, 2018
Code- #include <stdio.h>
- void NextPrime(int n)
- {
- int i;
- for(i=2;i<=(n/2);i++)
- {
- if(n%i==0)
- {
- NextPrime(n+1);
- return;
- }
- }
- }
- int main(void)
- {
- int n;
- scanf("%d",&n);
- NextPrime(n+1);
- return 0;
- }
sarathi trichy
- Oct 25th, 2007
#include<stdio.h>#include<conio.h>void main(){ int a,i;clrscr();printf( " enter the number");scanf("%d",&a);for(i=a;i<a+1000;i++){if(i==1||i==2||i==3||i==5|...
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fun(--n);
}
}
What is the output of the above program? Explain.">#includevoid fun(int);void main(){ inta; a=3; fun(a); }void fun(int){ if(n>0) { fun(--n); printf("%d",n); fun(--n); } } What is the output of the above program? Explain.
0 1 2 0
coolquasar
- Sep 15th, 2008
It proceeds like thisfun(3)fun(2)fun(1)fun(0)fun(-1)printf("%d",n)(Here n is 0)fun(-1)printf("%d",n)(Here n is 1)fun(0)printf("%d",n)(Here n is 2)fun(1)fun(0)printf("...
jintojos
- Jul 2nd, 2008
The out will be just like 3 2 1 0 2 1 0 1 0 0... not sureThis is a recursive function with 2 recursive calls one at line 13 and other in at line 15.The variable 'a' initial...
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What is source code of this tringle A A N I A N I R B A N I R B A N A N I R B A N P A A N I R B A N P A U L 2) A N I R B A N P A 3) 1 2 3 4 5 6 7 8 9
jeyaraj.ck
- Mar 18th, 2008
#define MAX 12int main() {char name[MAX] = "Bangalor";int i,j,k,odd,h=0; for(k=0,i=0,odd=1; i<4; i++,k+=odd) {if(k!=0) odd+=2;for(j=k; (j<k+odd)&&(h<MAX);j++) {printf("%c ",name[j]); h++;}printf("Backslashn"); }getch();}// Backslash is
jeyaraj.ck
- Mar 18th, 2008
3)123456789#define MAX 9int main() {int int_array[MAX] = {1,2,3,4,5,6,7,8,9}; int i,j,k,odd,h=0; for(k=0,i=0,odd=1; i<3; i++,k+=odd) {if(k!=0) odd+=2;for(j=k; (j<k+odd)&&(h<MAX);j++) ...
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How to write a sizeof function using a macro function?
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You have a link list. How can you tell whether there is a cycling in it?
santhigkinterview
- Jan 16th, 2008
Take 2 pointer. increment 1 pointer once and another pointer twice. keep incrementing unless pointer2 is NULL or when pointer 1 and pointer 2 are equal. When...
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What is the relation between array name and an element number.
jintojos
- Jun 9th, 2008
Array name is the base address of the aaray. By using this base address we can refer to the array elements. that is a[0] means "base address + 0th" element. that is array element number is the distence from the base address to the specified data
Joe
- Nov 20th, 2007
The relationship between an array element and the elements index number is as follows. 1. The array name by itself is a constant pointer to the first element of the a...
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Short int and int
What is the difference between short int and int?
jbode
- Feb 11th, 2012
The general idea is that short "always" represents a 16-bit integer, whereas int represents whatever the native word size is for that particular architecture (16- or 32-bit). "Always" is in scare quo...
sumit
- Feb 6th, 2012
Sorry to say that actually in most of C compiler short int is also of 16 bit and they are equivalent to each other.
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What's the best way to declare and define global variables
What's the best way to declare and define global variables and functions?
kbjarnason
- Jul 1st, 2010
The best way to declare and define global variables is to fix your code so you're not using them.The second best way is to determine whether you mean "file scope" - "global" bu...
rks_147
- Jun 20th, 2008
Best Way to represent a variable as global is , Just define the variable at the initial or just below the headers files ...
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Does ++p faster than p++?
kbjarnason
- Jul 1st, 2010
The correct answer is that the language does not define the performance of such operations; how they are implemented, how they are optimized and whether one is faster than the other are implementation-specific details, which may very well change, even radically, from one implementation to the next.
sandyseaweed
- Nov 7th, 2008
speed is the same. int iSpeedTest = i++;00413773 mov eax,dword ptr [ebp-0Ch] 00413776 mov dword ptr [ebp-150h],eax 0...
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Double Pointer
What is a Double Pointer? What are its specific uses.
jbode
- Oct 10th, 2011
By double pointers I assume you're talking about something like **ptr, as opposed to a simple pointer to a double object. Multiple levels of indirection show up in the following areas: 1. You want ...
garima
- Oct 6th, 2011
Double pointers are useful whenever you have defined user defined pointers in your main function. And you want to change their values from outside the main like in functions other than main. There the use of pointers is must.
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Execute C Program
How will you execute a file from another C program through C programming without system command?
yassiguy
- May 26th, 2010
We can store a shell code in another file. The shell code will spawn the new program. We can invoke the shell code from the parent program by reading it into memory and typecast the starting address to a function pointer and then invoking it.
rohitpant27
- Mar 27th, 2010
It can be included simply by:include "filename"only one file should contain the main() function.
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Return Multiple Values from Function
How to return multiple values in C language function?
Arpita Mishra
- Aug 4th, 2012
Multiple values can be returned from a function by using call by address i.e. pointers intelligently.
jbode
- Jan 3rd, 2012
Strictly speaking, a C function can only *return* a single value; you cant write something like "a,b,c=f();". However, you can write to multiple function parameters in addition to returning a value (...
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Pointers
Why do we need different types of pointers when it occupies the same memory space for any type of pointers?
supriti.dan
- Nov 30th, 2010
Pointer is a special kind of variable which can hold the address of other variable. As the address of any variable is a integer that's why pointer variable itself is always of integer type but in ...
mohamr2
- Sep 20th, 2010
Its not that we require different pointer, actually pointer are of the same size depending on the target platform that the memory belongs to. It is the pointer type that matters, we require an in...
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Source Code Output
Write a program which produces its own source code as its output?
abhishekagarwal5110
- Feb 24th, 2011
//File should be save as abhishek.cpp#include #includemain(int arg, char *arr[]){ FILE *pFile; clrscr(); int c; pFile=fopen ("abhishek.cpp","r"); if (pFile==NULL) perror ("Error opening file");...
abhishekagarwal5110
- Feb 24th, 2011
#include #includemain(int arg, char *arr[]){ FILE *pFile; clrscr(); int c; pFile=fopen ("abhishek.cpp","r"); if (pFile==NULL) perror ("Error opening file"); else { do { c = getc (pFile); printf("%c",c); } while (c != EOF); fclose (pFile); } getch();return 0;}
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Reverse String Stored in Pointer Array
Write a C program to reverse the strings stored in the following array of pointers to strings char *s[]={"To err is human..", "But to really mess things up", "One needs to learn C!!" };
rocking.piyush
- Feb 22nd, 2011
#include <stdio.h>#include <string.h>void reverse (char *);main(){ char *s[] = { "To err is human...", "But to...
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