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Programming Challenges - A List
Post 302120584 by matrixmadhan on Thursday 7th of June 2007 06:59:49 AM
06-07-2007
Quote:
Originally Posted by blowtorch
Challenge: DRAM
Difficulty: Easy to Medium in C, Easy in perl/python
As the problem says, the value of the palindrome may exceed your system's defined integer size in C/C++.
Difficulty: Easy to Medium in C, Easy in perl/python
As the problem says, the value of the palindrome may exceed your system's defined integer size in C/C++.
Code:
#include <stdio.h>
int reverseCheck(unsigned long);
int main()
{
unsigned long number = 2468;
unsigned long tmp = 0;
while ( tmp != number ) {
tmp = reverseCheck(number);
if( tmp == number ) {
tmp = number;
}
else {
number += tmp;
}
}
printf("Number:%d\n", number);
return 0;
}
int reverseCheck(unsigned long number) {
unsigned int i;
unsigned long num;
unsigned long sum;
for( num = number, i=1; num / 10; i *= 10, num /= 10 );
for( sum = 0; number > 0; sum += (number % 10) * i, number /= 10, i /= 10);
return sum;
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LEARN ABOUT REDHAT
sysinfo
SYSINFO(2) Linux Programmer's Manual SYSINFO(2) NAME
sysinfo - returns information on overall system statistics SYNOPSIS
#include <sys/sysinfo.h> int sysinfo(struct sysinfo *info); DESCRIPTION
Until Linux 2.3.16, sysinfo used to return information in the following structure: struct sysinfo { long uptime; /* Seconds since boot */ unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ unsigned long totalram; /* Total usable main memory size */ unsigned long freeram; /* Available memory size */ unsigned long sharedram; /* Amount of shared memory */ unsigned long bufferram; /* Memory used by buffers */ unsigned long totalswap; /* Total swap space size */ unsigned long freeswap; /* swap space still available */ unsigned short procs; /* Number of current processes */ char _f[22]; /* Pads structure to 64 bytes */ }; and the sizes were given in bytes. Since Linux 2.3.23 (i386), 2.3.48 (all architectures) the structure is struct sysinfo { long uptime; /* Seconds since boot */ unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ unsigned long totalram; /* Total usable main memory size */ unsigned long freeram; /* Available memory size */ unsigned long sharedram; /* Amount of shared memory */ unsigned long bufferram; /* Memory used by buffers */ unsigned long totalswap; /* Total swap space size */ unsigned long freeswap; /* swap space still available */ unsigned short procs; /* Number of current processes */ unsigned long totalhigh; /* Total high memory size */ unsigned long freehigh; /* Available high memory size */ unsigned int mem_unit; /* Memory unit size in bytes */ char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding for libc5 */ }; and the sizes are given as multiples of mem_unit bytes. sysinfo provides a simple way of getting overall system statistics. This is more portable than reading /dev/kmem. For an example of its use, see intro(2). RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
EFAULT pointer to struct sysinfo is invalid CONFORMING TO
This function is Linux-specific, and should not be used in programs intended to be portable. The Linux kernel has a sysinfo system call since 0.98.pl6. Linux libc contains a sysinfo() routine since 5.3.5, and glibc has one since 1.90. SEE ALSO
proc(5) Linux 2.0 1997-08-25 SYSINFO(2)