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What is Static function in C?and what is the use of it
vipin gupta
- Oct 20th, 2006
The question is already posted on the list..... A lot of answers are also available.... u should see the previous answers before posting a new problem.....
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How to write a program which prints its own source code as output?
_jawahir_
- Jun 17th, 2011
//***************jawahir007***************//#include<stdio.h>#include<conio.h>void main(int argc, char *argv[]){ char ch,*f,i; FILE *fp; clrscr(); for(i=0;argv[0][i]!='...
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C Code to print number in reverse
Write a program to print the given number in reverse order for e.g 123 as 321
Padma Sirisha
- Jul 13th, 2011
Here is the code
Code- #include<stdio.h>
- "enter the u want number");
- scanf("%d""the reverse number is;%d",reverseno);
- }
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Global variables in c program
If i initialize a global array locally in main function i can still access those elements in other functions as if the elements of array were global whereas this is not the case if i do the same with other basic variables like int i.can someone explain?
anjali_taneja
- Jul 6th, 2011
Global variables are stored in Heap.They have global access anywhere in the program.But local variable get priority over global variable.
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Calculate the weighted average of a list of n numbers
Calculate the weighted average of a list of n numbers using the formula
xavg = f1x1+f2x2+ ….+ fnxn
where the f’s are fractional weighting factors, i.e.,
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What is the output for the following code
main{int x=90;float *ptr;ptr=(float *)&x;*ptr=50.0;printf("%d",x);printf("%f",*pf);}Though the address of i & pf are same but the value which i get when i print x is a different integer value and when *pf is printed it gives the value 50.0 .why?
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When should the register modifier be used? Does it really help?
The register modifier hints to the compiler that the variable will be heavily used and should be kept in the CPU’s registers, if possible, so that it can be accessed faster. There are several restrictions on the use of the register modifier. First, the variable must be of a type that can be held in the CPU’s register. This usually means a single value of a size less than or equal to the size of an...
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How reliable are floating-point comparisons?
Floating-point numbers are the “black art” of computer programming. One reason why this is so is that there is no optimal way to represent an arbitrary number. The Institute of Electrical and Electronic Engineers (IEEE) has developed a standard for the representation of floating-point numbers, but you cannot guarantee that every machine you use will conform to the standard. Even if your machine does...
annusingh
- May 5th, 2008
A program running in the database that can take complex actions based on the inputs you send it. Using a stored procedure is faster than doing the same work on a client, because the program runs right inside the database server.
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What is the easiest sorting method to use?
The answer is the standard library function qsort(). It’s the easiest sort by far for several reasons: It is already written. It is already debugged. It has been optimized as much as possible (usually). Void qsort(void *buf, size_t num, size_t size, int (*comp)(const void *ele1, const void *ele2));
venki_max
- Mar 26th, 2006
Greetings!can u plz explain me the sorting function with its implementation in a small program and send it to my e-mail Id : venki_m182003@yahoo.com
rahul
- Oct 17th, 2005
Very amazing
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How can I sort things that are too large to bring into memory?
A sorting program that sorts items that are on secondary storage (disk or tape) rather than primary storage (memory) is called an external sort. Exactly how to sort large data depends on what is meant by “too large to fit in memory.” If the items to be sorted are themselves too large to fit in memory (such as images), but there aren’t many items, you can keep in memory only the sort key and a value...
pbchaudhari
- Aug 21st, 2007
Any how after merging that it will create the same problem to sort out. Will you please explain about that?
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What is the quickest searching method to use?
A binary search, such as bsearch() performs, is much faster than a linear search. A hashing algorithm can provide even faster searching. One particularly interesting and fast method for searching is to keep the data in a “digital trie.” A digital trie offers the prospect of being able to search for an item in essentially a constant amount of time, independent of how many items are in the data set....
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What is hashing?
To hash means to grind up, and that’s essentially what hashing is all about. The heart of a hashing algorithm is a hash function that takes your nice, neat data and grinds it into some random-looking integer. The idea behind hashing is that some data either has no inherent ordering (such as images) or is expensive to compare (such as images). If the data has no inherent ordering, you can’t perform...
neverd
- Jun 9th, 2007
Hash is actually using a maping function to map the items to keys, if two different items map to one key, a collision solution is needed.
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What is the difference between text and binary modes?
Streams can be classified into two types: text streams and binary streams. Text streams are interpreted, with a maximum length of 255 characters. With text streams, carriage return/line feed combinations are translated to the newline n character and vice versa. Binary streams are uninterpreted and are treated one byte at a time with no translation of characters. Typically, a text stream would be used...
kbjarnason
- Jul 2nd, 2010
The primary differentiation between text and binary modes as far as C is concerned has to do with line endings.? Take a look at a printf statement; note that many of them end in a n.? n is not, as one...
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What is a macro, and how do you use it?
A macro is a preprocessor directive that provides a mechanism for token replacement in your source code. Macros are created by using the #define statement. Here is an example of a macro: Macros can also utilize special operators such as the stringizing operator (#) and the concatenation operator (##).The stringizing operator can be used to convert macro parameters to quoted strings, as in the...
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Can a file other than a .h file be included with #include?
The preprocessor will include whatever file you specify in your #include statement. Therefore, if you have the line #include <macros.inc> in your program, the file macros.inc will be included in your precompiled program. It is, however, unusual programming practice to put any file that does not have a .h or .hpp extension in an #include statement. You should always put a .h extension on...
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How are portions of a program disabled in demo versions?
If you are distributing a demo version of your program, the preprocessor can be used to enable or disable portions of your program. The following portion of code shows how this task is accomplished, using the preprocessor directives #if and #endif: int save_document(char* doc_name) { #if DEMO_VERSION printf(“Sorry! You can’t save documents using the DEMO version of this program!n”); return(0); #endif...
kbjarnason
- Jul 2nd, 2010
The example given has a flaw. It essentially works like this:void SaveFile( char *fname, void *data ){#if DEMO puts( "Nope, sorry, no can do" ); return;#endif &n...
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Is it better to use a macro or a function?
The answer depends on the situation you are writing code for. Macros have the distinct advantage of being more efficient (and faster) than functions, because their corresponding code is inserted directly into your source code at the point where the macro is called. There is no overhead involved in using a macro like there is in placing a call to a function. However, macros are generally small and...
Manan Jadhav
- May 4th, 2011
macros are usually preferred when the code is very small... They are usually faster as compared to the functions as the code itself is expanded in the original code where as for function there is a co...
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How can type-insensitive macros be created?
A type-insensitive macro is a macro that performs the same basic operation on different data types. This task can be accomplished by using the concatenation operator to create a call to a type-sensitive function based on the parameter passed to the macro. The following program provides an example: #include <stdio.h> #define SORT(data_type) sort_ ## data_type void sort_int(int** i); void sort_long(long**...
abhimanipal
- Jan 30th, 2010
There is small bug in the above programWhen the macro is define it is written as SORT, but when it is used it is written as sortThis will give an error
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