OJ Board

Hope this help

[cpp]

#include <fstream.h>

void main()
{
char str[1024];

ifstream in("data.txt");

if (in.is_open())
{
while (in.getline(str, sizeof(str)))
{
// the process is here
}

in.close();
}
}

[/cpp]

Hi,

Help plz, attached is my code. Is it a right way to copy unsigned char* to int variable? Thanks in advance...

-fresh :oops:

[cpp]

#include <string.h>
#include <stdio.h>
#include <stdlib.h>

void main()
{
int len;
char tmp[1024*8];
unsigned char *ptr, buf[1024*8];
char *s1 = "ACM ...

Hi, so many ways to alloc 2d array. But how to free it?

[cpp]
#include <stdio.h>
#include <stdlib.h>

void main()
{

char **x = (char**)malloc(5);

for (int i=0; i<5; i++)
x = (char*)malloc(20);

for (i = 0; i < 5; i++)
sprintf(x , "string#%d", i + 1);

for (i = 0; i < 5; i++)
printf("%s ...

I don't understand. Can I get the full code? What happen to the last bytes of the file... have they been deleted?

-novice

Help!

Hi,

I created a text file. Write 5 byes('ABCDE') to the file. After closing the file... I want to delete its last character('E') by reading all file contents and recreating a new one with same filename. Is it possible to do this in just one time 'fopen()'? Facing with problems when the file size is ...

Thanks....

- novice

Hi,

I'm looking for the fastest algorithm to convert an unsigned int to string in format x,x,x,x,x. Thanks...



void convert(unsigned int, char *buf)
{
// need help
....
....
....
}

void main()
{
char buf[1024];
unsigned int x = 2123456;

convert(x, buf);
printf("%s\n", buf); // buf = 2 ...

I think that solutions to problems should not be accessible, at least not for many problems. If there are solutions to many problems, it would be easy for someone to send them all to online judge and appear on front page of the ranklist. Every person who don't cheat and work for months/years to ...

fpnc wrote:Right now everything will be hold as is - Real Time System Status shows numbers unless you use "T" option, and the other ranklists will show the name if they show it now. It may be changed in the future, however.

How?

-novice

Hi,

Another simple question, what is the different (faster) between using pointer and set element index, as below? I dont know... :-?

[cpp]
char str[100] = "abcdefghijklmnopqrstuvwxyz";

for (int i=0; str ; i++)
printf("%c", str );
[/cpp]

[cpp]
char *ptr, str[100] = "abcdefghijklmnopqrstuvwxyz ...

They do, look at .\contrib\mpi_cpp\mpicpp.h

-novice

Look at this,

http://thayer.dartmouth.edu/~sting/mpi/

-novice

I don't want to break the rule. The code below convert my BigInteger to a base (2 - 64) string. The method#1 might faster than the #2 but ... any comment?

Method#1
[cpp]
static const char *BASE_DIGIT = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/";

char *BigInteger::toString ...

Hi,

Another question about pointer. My simple code as below, why ptr still hold the value after b was freed? What happen to elements[0-3]? Did they completely freed?

[cpp]
char *GetString()
{
char *ptr, *b = new char[10];

b[4] = 'F';
b[5] = 'r';
b[6] = 'e';
b[7] = 's';
b[8] = 'h';
b[9 ...