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Memory Stack or Heap
Which type of memory(stack or heap)is used by static and external variables?
kbjarnason
- Jul 1st, 2010
Since C has no concept of "stack", the question of whether stack or heap memory is used seems a bit unclear.Static variables come in two distinct flavours: file scope and block scope. ...
niyas15
- Mar 2nd, 2010
The static variable is stored at data section and local variables are stored at stack and dynamic allocation of data are strored at heep
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How do you decide which integer type to use?
kbjarnason
- Jul 2nd, 2010
The first consideration is the range of values to be stored. If they're beyond the minimum required range of, say, an int, then you can't use an int - use a long (or long long, or other ...
dattatray shinde
- Jun 21st, 2008
Its depends on data which your using.suppose you want to store the age then CHAR age is useful.
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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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Difference between reference and pointer?
What is difference between reference and pointer or pass by reference and pass by pointer?
kbjarnason
- Jul 1st, 2010
Since this is posted in a C section, the main difference is that in C, pointers exist and references don't. That's C++.
abhimanipal
- Jan 16th, 2010
Is there any advantage of using a reference variable as opposed to using a pointer. I mean pass by reference ( by using pointers ) was implemented in C. Why is this new technique of pass by reference (using reference variable ) invented for C++
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Find the binary form
Write a program to find the binary form for the given charcter input.eg:- for 'A' ASCII value is 65 and its binary form is 1000001.
kbjarnason
- Jul 2nd, 2010
This seems a rather pointless endeavour, as the binary representation of, say, 'a' will vary with the execution character set. For example, in EBCDIC, 'a' has a value...
elexpert_arka
- Aug 31st, 2009
Here is a simple code which will just get each bit of the char by AND operationint main (){ char a; int i,j; printf("Enter a charn"); sc...
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How can a character and a string with only one character can be differentiated? What is the internal difference between a character and string, with only one character in it?
kbjarnason
- Jul 2nd, 2010
Easy: they're different types.char s[] = "a";char c = 'a'';There are a few cases where this could be problematic. For example:void func( char *p ){ while ( ...
yrenster
- Feb 5th, 2008
A character is a interger in the range -127 to 127. You can set a char value using interger. for example, the character 'a': char cc = 141; The string "a" is not a integer, a string ...
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What is base address? How is it associated differentiantly for one dimentional and 2 dimentional array?
kbjarnason
- Jul 2nd, 2010
Note that C does not have two-dimensional arrays; it has arrays of arrays.char a[10][20];This is not a two-dimensional array; it is an array (with 10 elements) of arrays (each with 20 elements).In the...
jaydev
- Nov 19th, 2007
Base address is a actualy address of 0th element of an array and in two dimanstionarray it will 0(zero)th row and 0(zero)th coloum of array.
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}
">Main(){ int i, j, *p; i = 25; j = 100; p = &i; // Address of i is assigned to pointer p printf("%f", i/(*p) ); // i is divided by pointer p}
A) Compile errorB) 1.00000C) Runtime error.D) 0.00000Explanation: Error because i/(*p) is 25/25 i.e 1 which is int & printed as a float, so abnormal program termination, runs if (float) i/(*p) -----> Type Casting.
jbode
- Jun 30th, 2010
The %f conversion specifier expects its corresponding argument to be of type double, but the result of i/(*p) is type int (since both operands have type int); therefore, the behavior is undefined (per...
track92
- Jun 15th, 2010
P is a pointer to the int variable i and *p prints the value stored in the address (of i) which it points. So answer will be 1 but data type is float so it will print 1.000000.
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printf("%d %d", i, j);
}
">Main(){ int i, j; scanf("%d %d"+scanf("%d %d", &i, &j)); printf("%d %d", i, j);}
A) Compile errorB) 0, 0C) Runtime error.D) the first two values entered by the userExplanation: two values entered, 3rd will be null pointer assignment
jbode
- Jun 30th, 2010
The behavior is undefined. There are not enough arguments for the given conversion specifiers in the scanf() calls (7.19.6.2.2). It looks like the intent is for the inner call to scanf() t...
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Read and Sort 30 integers into One Dimension Array
Write a C programme that read 30 integer numbers into one dimension array then using a function to sort them in desinding order (this function should use another function to exchange any two elements int the array) after that print desorted elements?
jbode
- Jun 30th, 2010
"c #include #include #include /** * Read up to max_len integer values from the specified stream into ival. */ void getValues(FILE *stream, int *ival, size_t max_len, size_t *...
sarojkumar21.panda
- Sep 3rd, 2009
Hi , Let break the question into three parts 1-Read 3o intgers and store them in one dimensional array. 2. Write one function to sort them in descending order.Let the function name i...
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p[0] = 'H';
printf("%s", p);
}
">Main(){ char *p = "hello world"; p[0] = 'H'; printf("%s", p);}
A) Compile errorB) “Hello world”C) Runtime error.D) “hello world”
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Platform Independent IPC Methods
Which IPC methods are Platform independent?
hansa31
- Jun 25th, 2010
We normally use IPC for exchange of data between multiple threads or processes. Following IPC are platform independent, 1. Files 2. Socket 3. Named Pipes 4. Shared Memory 5. Message Queue
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How to write a program in c for getting the length of a string without using the function STRLEN?
With the program
pavlov
- Jun 11th, 2010
You will have to write your own implementation of strlen() function in order to get the length of a string.It is not worthwhile to write your own function, as the library functions are really efficien...
angayarkanni packiam
- Aug 28th, 2007
Void main(){ char s[10]; int i; scanf("%s",s); for(i=0;s[i]!='';i++); printf("The length of the given string",--i); getch();}thank you!!!!!!!!!!!!
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End of File
What is the significance of EOF?
md.jahidanwar
- Jun 3rd, 2010
EOF is simply a macro designating a negative value. Some books are refered EOF is -1. It doesn't have to be -1. You can signal end-of-file from the command line with a control character(Ctrl ^), usually a combination of ctrl+z for Windows systems or ctrl+d for POSIX systems. Thanks, MJA
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If the following program (myprog) is run from the command line as myprog 1 2 3, What would be the output? main(int argc, char *argv[]) { int i,j=0; for(i=0;i<argc;i++) j=j+ atoi(argv[i]); printf("%d",j); } a) 1 2 3 b) 6 c) error d) "123"
komaldhote
- May 28th, 2010
Ans is 6.atoi is the function which return the decimal or digits in string.
Tonni
- Apr 7th, 2007
B) 6atoi fails on the first element of argv[], being "command.exe", but atoi returns 0 in case of failure.
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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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Link List
What is Link list? What is purpose of link list in programming.
Aadarsh sharma
- May 4th, 2010
Linked list is a set of array (uses 2 line array) i.e INFO (information part) and LINK (address part)we use it for storing of data dynamically i.e it does not leave buffer space (less wastage of memory)
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Srand() and rand() Functions
Explain srand() and rand() Functions
UncaAlby
- Apr 20th, 2010
rand() uses what is known as a "multiplicative congruential" method for generating pseudo-random numbers between 0 and 32767. (The exact maximum can be system dependent.)It will start ...
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char *b = "World";
clrscr();
printf("%s", strcat(a,b));
}
">Main(){ char *a = "Hello "; char *b = "World";clrscr(); printf("%s", strcat(a,b));}
A) HelloWorldB) Hello WorldC) HelloD) None of the above
pratikgotal
- Apr 2nd, 2010
I think segmentation fault error is dependent on the operating system you are using. I think if you run the code in Windows it will not give any error while when you run the same code in UNIX you will gate segmentation fault.
abhimanipal
- Jul 22nd, 2009
It will give a sementation faultThe pointer a is allocated just sufficient space to accomodate "Hello". When we add beyond that it will give a seg fault
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fork();
}
how many times "welcome to the world" message will print ?">What would be the output of the following program ?main (){printf ("welcome to the world");fork();}how many times "welcome to the world" message will print ?
pratikgotal
- Apr 5th, 2010
The fork() system call will spawn a new child process which is an identical process to the parent except that has a new system process ID. Hence printf ("welcome to the world"); this statement execute infinite time
wizard
- Feb 27th, 2007
It will print one time only, bzc after fork there is no printf statments. the printf statement is before fork so for parent it will print.
C Interview Questions
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