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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.?
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Declare Array of N Pointers
How do you declare an array of N pointers to functions returning pointers to functions returning pointers to characters?
jbode
- Jan 10th, 2011
Non-typedef'd version:char *(*(*funcArray[N])())();Which is read as follows:funcArray -- funcArray funcArray[N] -- is an N-element array ...
Jayakrishnan Chathu
- Jan 9th, 2011
Define a function pointer that returns a pointer to chartypedef char * (cfuncptr*) ();Define a function pointer that returns a function pointer, which returns a pointer to char.typedef cfuncptr ...
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Declare an array of N pointers
How do I declare an array of N pointers to functions returning pointers to functions returning pointers to characters?
jbode
- Aug 20th, 2011
Arr is an N-element array of pointers to functions returning pointers to functions returning pointers to char.
Code -
How do you loop a program to display your name however times you want it to.
and to display " Hello %s!! Do you want to try again [Y/N]? "
jyothisudi
- Aug 6th, 2011
Here is the code
Code- #include<stdio.h>
- #include<conio.h>
- "enter your name");
- scanf("%s""enter the number of times you want to repeat the loop");
- scanf("%d""%s""Hello %s!!! do you want to try again Y/N"'Y')
- }
Rajath
- Aug 5th, 2011
Read the name from the user and until his choice becomes 0 keep printing his input name through the while loop "c #include #include int main() { int i,n; char name[100]; ...
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Difference between printf and cprintf
What is the difference between cprintf and printf? Please explain in detail.
indinfer
- Nov 16th, 2014
I think the original question was not a typo. The original question was printf, not fprintf, compared to cprintf. And I think printf output goes to stdout (standard out) which by default goes to con (the console). cprintf output goes only to con.
Howard Lee Harkness
- Apr 4th, 2013
Cprintf outputs to the console device.
fprintf outputs to a stream specified by the 1st parameter. -
What change is required in the following program so that its output becomes 3,6,11,20,37,......1034?
c#include
#include
int main()
{
int a=1,r=2,i;
for (i=0;inira
- Jul 1st, 2014
Much easier approach, this is a logic question, not programming
Code- #include<stdio.h>
- #include<math.h>
- ",%d "
What will be output if you will execute following c code?
c #i ain()
{
float p=1,q=2,r=-2,a;
a=avg(p,(q=4,r=-12,q),r);
printf("%f",a); return 0;
}
float avg(float x,float y,float z)
{
return (x+y+z)/3;
}
a) 1.000000
b) 0.333333
c) -2.333333
d) 1Program to print all prime numbers btw 1 to 100
C Program to print all prime numbers btw 1 to 100..pls explain the program: What is if(p)??cpp#include
#include
int main()
{
int num,n,div,p;
printf("Enter any number: ");
scanf("%d", &num);
for(n=2; njbode
- Mar 8th, 2017
To answer the specific question, "if(p)" is the same thing as "if (p == 1)" or "if (p != 0)". The variable "p" is being used as a flag to indicate whether the current candidate number ("n") is prime ...
Rajkumar Yonzan
- Feb 24th, 2017
// Wap to display all prime number from 1 to 100. //
#include
#include
void main()
{
int i,j,n;
for(n=1;nOutput for following and explanation
j=scanf("%d",&i);
printf("%d",j);jbode
- Feb 2nd, 2017
`scanf` returns the number of successful conversions and assignments, or EOF if it hits the end of the input stream before any characters had been read. In this particular case, it will return 1 on s...
nitin
- Jan 30th, 2017
1, the scanf success return 1 fail return 0.
What is the benefit of using #define to declare a constant?
Using the #define method of declaring a constant enables you to declare a constant in one place and use it throughout your program. This helps make your programs more maintainable, because you need to maintain only the #define statement and not several instances of individual constants throughout your program. For instance, if your program used the value of pi (approximately 3.14159) several...
kbjarnason
- Jul 2nd, 2010
I see examples such as #define PI 3.1415, which show _how_ you can use a define to declare a constant, but don't exactly explain _why_ you'd want to do this, rather than, say, const double PI ...
janhavibend
- Jul 24th, 2008
When you define constant variable there is possiblity that it's value may get changed in the program accidently by use of say pointer, but if you define constant by #define it's value can't be changed. This is also one of the benifit of using #define.
How can I convert a number to a string?
The standard C library provides several functions for converting numbers of all formats (integers, longs, floats, and so on) to strings and vice versa The following functions can be used to convert integers to strings: Function Name Purpose itoa() Converts an integer value to a string. ltoa() Converts a long integer value to a string. ultoa() Converts an unsigned long integer value to a string....
kbjarnason
- Jul 1st, 2010
Note that while itoa, ltoa and the like may be provided, these are not standard functions. itoa is, but is both unreliable and used for a different purpose.There is no trivial "one size fit...
Which expression always return true? Which always return false?
expression if (a=0) always return false expression if (a=1) always return true
Vikramojha
- Jan 31st, 2010
Here the question exactly means the statement which will always irrespective of any condition and the statement which will never execute, so here if we useif (1) it will always execute or will return true andthe statement if (0) will never execute or will always return false.
nsivaramprasad
- Nov 28th, 2005
Irrespective of the value of a variable a, a^a always return FALSE (0)!(a^a) always return TRUE (1)
What is the value of y in the following code?x=7;y=0;if(x=6) y=7;else y=1;A. 7B. 0C. 1D. 6
Chithambaram.P
- Jan 11th, 2007
Answer is y=7 Becoz here we r assigning the value to x=6,not checking condition,we will see the operator meaning carefully
Pick out the odd one outA. malloc()B. calloc()C. free()D. realloc()
molakalapalli murali kris
- Mar 19th, 2008
Ya answer is FREE() bczmalloc() is used to allocate single block of memorycalloc() is used to allocate multible blocks of memoryrealloc() is used to reallocate the allocated memorybut free()is used to deallocate the memory
Nishi Rathore
- Sep 25th, 2007
Free() is odd because rest functions are used to allocate memory and free is used to deallocate the memory
The format specified for hexadecimal isA. %dB. %oC. %xD. %u
What is the draw back in using friend function in c++
kbjarnason
- Jul 2nd, 2010
The basic problem is that it blows away your encapsulation. Friend functions see right through "protected" and "private" and can see blinkin' everything.Or, in other words, "your friends get to play with your private parts." :)
muthu kumar k
- Mar 27th, 2006
check this FAQ listhttp://www.parashift.com/c++-faq-lite/friends.html#faq-14.3
Main(int argc, char *argv[]) { (main && argc) ? main(argc-1, NULL) : return 0; }
A) Gets into Infinite loopB) Compile error. Illegal syntaxC) None of the aboveD) Runtime error.Explanation: illegal syntax for using return
Main(){ char * strA; char * strB = I am OK; memcpy( strA, strB, 6);}
A) Compile errorB) I am OKC) Runtime error.D) I am OExplanation: I am OK is not within " "
mani2881
- Oct 22nd, 2007
the memcpy function will copy n bytes from the object pointed by strB into strA. If the copying takes places between objects that overlap, the behaviour will be undefined. If these to char pointer is assigned an address which don't overflow, this would work.Thanks,mani
vikas
- Apr 28th, 2006
Its the Runtime error as strA hasnt been allocated any memory
Ans