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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...
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Find Number of Occurrences
How will you find the number of occurrences of a particular string in the given input string?
kbjarnason
- Jul 1st, 2010
The question is insufficiently specified. For example: "Find the number of occurrences of NN in the string NNNNN"One answer would be 2 occurrences - the first NN pair, the second...
printfbabu
- Dec 29th, 2009
Int computeSubStrings(const char *string,const char *substr){ int count = 0; char *token = strstr(string,substr); while(token != NULL) { count++; token = strstr(token + 1,substr); } return count;}The above function can be used for counting no. of occurences of a substring in a string
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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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Memory Allocation
we say stack is allocated to the local variables ,formal arguments and return addresses of a function for manipulating function calls?but the question arises when does the stack allocation to above things take place?at compile time or run time.And by the way what about automatic memory allocation.what is it?
kbjarnason
- Jul 1st, 2010
C neither requires nor defines a stack; at most it requires, in some cases, behaviour which is stack-like, but could be provided by any number of means.As to when the allocation is done, again, this i...
coolquasar
- Sep 15th, 2008
Memory is allocated only during the runtime, and compiler just decides the amount of memory needed by each variable... It just adds the displacement value to be added to the Base Stack pointer for "Local Variables" Allocation.
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A Program that does nothing
Write a program in C that does nothing not even takes memory?
kbjarnason
- Jul 1st, 2010
I suspect it is impossible to write a C program which "takes no memory", unless one rewrites the startup code for the implementation.For example, argv[0] is the "program name", whi...
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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.
C Interview Questions
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