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Can a variable be both const and volatile?
Yes. The const modifier means that this code cannot change the value of the variable, but that does not mean that the value cannot be changed by means outside this code. For instance, in the example in FAQ 8, the timer structure was accessed through a volatile const pointer. The function itself did not change the value of the timer, so it was declared const. However, the value was changed by...
Ajay
- Apr 17th, 2017
Interrupt status register should be changed by the program. For example, if status register is updated by the hardware for some kind of interrupt. In our program we read the status register to service...
YanChenChi
- Dec 9th, 2010
Const variable/objects are read only variable; it does not mean that it is stored in ROM(Read Only Memory).
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Can static variables be declared in a header file?
You can’t declare a static variable without defining it as well (this is because the storage class modifiers static and extern are mutually exclusive). A static variable can be defined in a header file, but this would cause each source file that included the header file to have its own private copy of the variable, which is probably not what was intended.
sssss
- Nov 11th, 2007
In CThe scope of static variable is file. ie., if declared the variable is accessible accross the file.When declared the vairable in a header then its exposed to where ever its included. Every f...
vg_220
- Aug 14th, 2007
We are talking C. Isn't it? C doesn't have class construct so please think the 'C' way ! According me, static declaration in a header file should not generally be useful. Can anyone suggest a good use of it?
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What is the difference between a string and an array?
An array is an array of anything. A string is a specific kind of an array with a well-known convention to determine its length. There are two kinds of programming languages: those in which a string is just an array of characters, and those in which it’s a special type. In C, a string is just an array of characters (type char), with one wrinkle: a C string always ends with a NUL character. The “value”...
RANJIT KUNDU
- Sep 25th, 2017
Array is a group of similar data types or strings where string is a single line collection of same data types. Whatever see the examples and explanation, array can be multi dimensional means it can ac...
Sooraj Kumar
- Aug 3rd, 2011
An Array is collection of elements of similar type which are referred by a common name.Each element is accessed by its value. First element has index 0 and last element has index which is 1 less than ...
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What does the following function print?func(int i){if(i%2)return 0;eale return 1;}main(){int =3;i=func(i);i=func(i);printf("%d",i);}a.3b.1c.0d.2
C
avula chiru
- Sep 30th, 2010
The answer is 1 because where i%2 it gives 1 then if condition is true and it returns 0 to the main, again we call the function then if condition fails and then else part execute so answer is 1.
anon1987
- Dec 7th, 2009
Ans :: C Because :: func(3) >>> return(1) >> i=1; func(1) >>> return(0) (because i is int type) >> i = 0 will be printed.
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What is the difference between "overloading" and "overridding"?
nebudotcom
- Aug 5th, 2010
Overloading:Using more than one function with the same name but with different signatures Overriding:* Two functions having same name located in two different classes* When an object is created for subclass, it will override the baseclass ie the subclass function will get evoked.
SUVI_1990
- Jun 13th, 2009
Overloading, an assignment operator is overloaded in a base class, it cannot be inherited in a derived class. And overriding is to create a new class using derived class.
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}
">Main(){ int i; float *pf; pf = (float *)&i; *pf = 100.00; printf("n %d", i);}
A) Some Integer not 100B) 100C) Runtime error.D) None of the aboveExplanation: Output = 0
wrongmove
- Dec 11th, 2008
IEEE-754 Floating is used to store Float. So while storing float s store with encoded format. When i is used to access this value it reads 4 bytes which are nothing but IEEE-754 Floating encode. if you type that number in IEEE-754 Floating calculator it will show it as 100.
bipi2g
- Jun 28th, 2007
Yes, Compile and run by Dev-C++. Output is garbage (i see 1120403456 in output window).
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}">
Union u{ struct st { int i : 4; int j : 4; int k : 4; int l; }st; int i;}u;main(){ u.i = 100; printf("%d, %d, %d",u.i, u.st.i, u.st.l);}
A) 40, 4, 0B) 100, 4, 0C) 0, 0, 0D) 4, 4, 0
opal_sybil
- Aug 28th, 2010
The struct notation int i : 4; specifies the size of integer i in bits, so the value of i will be represented by 4 bits. In this case we have a signed int with a possible values of -8 to 7. Whe...
yba
- Jul 10th, 2007
The output should contain 100 as the first number.The union declares that st.i is a 4-bit field, and 100 can fit in 4 bits, however, you need to know how your compiler allocates bitfields. Are t...
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}
">Const int perplexed = 2;#define perplexed 3main(){ #ifdef perplexed #undef perplexed #define perplexed 4 #endif printf("%d",perplexed);}
A) none of the aboveB) 4C) 2D) 0
indira.moparthi
- Apr 19th, 2009
Perplexed is a const variable. In the # define we are?trying to?modify the value which leads to an error.
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What is far pointer?
jintojos
- Jul 7th, 2008
Far pointers are mainly used for 32 bit addressing that is the segment offset addressing. Normal pointers?can onLy access the memory locations which is allocated by the compiler for that program. Far...
mahendra
- Apr 11th, 2006
When the function is present out side the segment, it requires base address and offsetaddress. To access the function, the base and offset addersses are required to specify. This is like the far jum...
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What is the meaning memory allocation & why we use it?
yagnam ramesh babu
- Nov 5th, 2007
allocation of memory for a particular variable like is done because to save unusage of memory
Gautam Bhalla
- Jul 20th, 2007
Memory Allocation:--Memory allocation is nothing but allocation of a block of memory or storage register from RAM to keep track of previous instractions or variables we are dealing with.Need:-Memory allocarion is important to keep the track of current value of the data items and instructions.
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Whats is structure padding?Say a given structureStruct{int a;char c;float d;}the size of structure is 7 here.But structure padding is done what will be the size of the struct?Will it change and how?How to avoid this?is it necessary?
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C is not platform dependent.Why?
we know that C is not platform independent.but if we make a program on a operating system and copy the same program on other os without any changes then this program will run after compiling and will give the same answer.
so if same program will run on other os then why C is not platform independent.
Ramesh Yadav
- May 4th, 2012
C is not platform dependent because it does not generate the uniform executables.
suppose if we have build C code and generated binary in Windows and this same binary will not work on Linux.
jbode
- Oct 3rd, 2011
It is true that *some* programs can be compiled on other systems without any changes and produce the same outputs. "Hello, World" should work everywhere with no changes. However, such trivially port...
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C Pyramid Program
1
1 2 2
1 2 2 3 3
1 2 2 3 3 4 4
how to create this pyramid using cWhen should a type cast be used?
There are two situations in which to use a type cast. The first use is to change the type of an operand to an arithmetic operation so that the operation will be performed properly. The second case is to cast pointer types to and from void * in order to interface with functions that expect or return void pointers. For example, the following line type casts the return value of the call to malloc()...
kbjarnason
- Jul 2nd, 2010
Very, very, *VERY* rarely. My rule of thumb is, if you see a cast, expect a design error.One classic example of this is the oh-so-popular casting of the return value of malloc. Don't d...
srinivasrao
- Oct 9th, 2007
Type cast should be used in case of if we want to assign a void pointer to a pointer of some data type.eg:void *ptr;int *c;c=(int *)ptr;
What are the characteristics of arrays in C?
1) An array holds elements that have the same data type 2) Array elements are stored in subsequent memory locations3) Two-dimentional array elements are stored row by row in subsequent memory locations.4) Array name represents the address of the starting element5) Array size should be mentioned in the declaration. Array size must be a constant expression...
If we pass null pointer in malloc or calloc function, What will be the result?
kbjarnason
- Jul 2nd, 2010
You don't pass null pointers to malloc or calloc. You can pass them to realloc.Perhaps you mean what would happen if you did this:#include <stdlib.h>int main(void){ char *p...
kannan987
- Jun 13th, 2008
Test.h is nothing but in my pgm..simply include all header files..<----test.h--->#include<stdio.h>#include<conio.h>#include<stdlib.h>#include<string.h>
Difference between Funtion to pointer and pointer to function
rocking.piyush
- Feb 23rd, 2011
That are not same.Function to a pointer means the return value of the function is a pointer Ex:- int *func (int x,int y)Whereas pointer to a function is the declaration of pointer that holds the base address of the function. Ex:-int (*func) (int x,int y)
Ajay Kanse
- Dec 22nd, 2008
Both are same. There is lot of confusion around this but function point and pointer to function are same.
Ans