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Write a program which accepts a filename as a command line argument and reverses the contents of the file( ie first character becomes the last character of the file and so on) Input: The program takes the file name whose content should be reversed. Output: The program reverses the contents of the file.
y.swathi
- Jan 29th, 2007
Its very useful
bmlal
- Jul 14th, 2006
int main(int argc, char *argv[]){ int fd, i, fsize; char *first=(char *) malloc(1); char *last=(char *) malloc(1); fd = open(argv[1], O_RDWR); fsize = lseek(fd, 0, SEEK_END); for (i=0; i lessthan fsiz...
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How to type a string without using printf function?
jintojos
- Jun 16th, 2008
Using Video Memory We can write a string into the screen.....that is the string is directly placed into the Video memory...ExampleVideo Memory Address : 0xb0008000 pgm: void main() { int i=0; ...
shaanxxx
- Aug 20th, 2006
Use write system call write (1 , "XXXXXXXXXXXXXXX" , strlen("XXXXXXXXXXXXXXX" ));
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How do we get Square root of any number Without using sqrt() fuction?
Divick Kishore
- Feb 25th, 2011
A better approach would be to use newton raphson method. An equivalent python program would be written as:import sysimport osi = 0def sqrt_p(num, prev_sqrt): global i i += 1 if ( i > 5 ): return c...
R.S.Jayasathyanarayanan
- Dec 17th, 2006
#include main(){int a=5;int b=a^(.5)tf("%d", b);}
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fork();
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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.
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plz simplify the statement the 2 .when i run program gives undefined symbol p..but in a/c mcq that is correct ..say collect address of i ..how?? ">1)what is RTTI in c++?2)main(){ int i=10; int &p=i; //statement 2printf("%d %d"i,p);}plz simplify the statement the 2 .when i run program gives undefined symbol p..but in a/c mcq that is correct ..say collect address of i ..how??
Sukumar Paul
- Aug 2nd, 2010
Hello anuj, This program should compile and run in Turbo C++3.0 Anyway, here you have declared and defined a integer variable 'i' initially its value is 10. Then you are declaring a reference ...
abhimanipal
- Jan 21st, 2010
There is no error in the program. The program compiles perfectly. when he writes int &p =i; p is a reference variable and it points to i. So there is no problem as such
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What is far pointer and where should we use it?
suchi kumari
- Jul 19th, 2016
What is the meaning of char far in c is not clear? Why it is used for a pointer declaration
Code- span style="color: #ff0000;">"%d%d"
kbjarnason
- Jul 2nd, 2010
C has no "far" pointers, it only has pointers.Some (generally ancient) compilers, notably for DOS, did offer near, far, and huge pointers. This was due to how DOS managed memory.Basica...
Pointer Use
Why do we use pointer instead of variable?
jbode
- Sep 30th, 2010
We *must* use pointers for the following:1. To fake pass-by-reference semantics;2. To track dynamically allocated memory;3. To build self-referential data structures.If we want a function to modify...
Cmkraj
- Sep 15th, 2010
List of pros & cons of pointers over variables1. Fetching speed is faster thru pointers as pointers directly access the memory2. Useful in the concepts of pass by reference. variable value can be chan...
Finding a number which is a power of 2in a single step
How to find whether the given number is a power of 2 in single step (without using loops)?
How do you redirect a standard stream?
Most operating systems, including DOS, provide a means to redirect program input and output to and from different devices. This means that rather than your program output (stdout) going to the screen; it can be redirected to a file or printer port. Similarly, your program’s input (stdin) can come from a file rather than the keyboard. In DOS, this task is accomplished using the redirection characters,...
jintojos
- Jun 9th, 2008
By using the operators "" we can redirect the standard input and out streams.example : d:> jinto.exe > outputredirected d:> jinto.exe < inputredirected
The operator for exponentiation isa.**b.^c.%
A
souravray_88
- Feb 6th, 2010
I think that C doesn't define any opeartor for exponential function. It rather provides us with a pow(number, number_to_the_power) function that helps us to do the exponential opearations.
Shashi
- Aug 18th, 2007
Unbelievably, there is no built-in exponentiation operator in C. Instead, there is a library function (pow) which carries out this operation.
What is the output of the following sample C Code
Int *ptr = (int *)malloc(100*(sizeof(int)));ptr++;free(ptr);
jbode
- Nov 29th, 2013
First of all, you can clean up that malloc call (see attached code). You shouldn't cast the result of malloc; its unnecessary, and under compilers that use the 1989/1990 standard, it can suppress a d...
sourav punoriyar
- Sep 5th, 2013
"c int *ptr = (int *)malloc(100*(sizeof(int))); ptr++; free(ptr); i think it will allocate 400 bytes...int taken as 4 bytes..gcc compiler..and send base address to po...
Lint is 1. a C compiler 2. an inter-active debugger 3. a C interpreter 4. a tool for analyzing a C program
dasam
- Apr 2nd, 2007
Lint was the name given to a tool flagged suspicious and non-portable constructs (ie, likely to be bugs) in C language source code. Ans is 4} tool for analysing c program
gaurav_gangwar9
- Mar 17th, 2007
I think ans is 4, as? this is used for analysing source code, However it can be used for flagging bugs
Which of the following is not an infinite loop?A. while(1){ ....}B. for(;;){...}C. x=0; do{ /*x unaltered within the loop*/ .....}while(x = = 0);D. # define TRUE 0 ... while(TRUE){ ....}
K.Rana Pratap
- Jan 14th, 2007
It is not c) becoz in while loop comparision takes place that is 0==0(which is true and returns the value 1) so while loop executes and it goes in infinite loop. The correct answer is (D) becoz in while loop condition becomes false with zero(0) and never enters into the loop.
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.
Ans