C/C++

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fh = fopen_or_warn(_PATH_PROCNET_DEV, "r");
if (!fh) {
    return if_readconf();
}

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Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
    lo:     104       1    0    0    0     0          0         0      104       1    0    0    0     0       0          0
  eth0:21798505   51360    0    0    0     0          0         0  7693686   46844    0    0    0     0       0          0

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<?php
if(file_exists("files/appleboy.c")) {
    echo "File found!";
}
?>

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bool file_exists(const char * filename)
{
    if (FILE * file = fopen(filename, "r"))
    {
        fclose(file);
        return true;
    }
    return false;
}

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int power(int x,int n)
{
    int i;
    int num = 1;
    for(i=1;i<=n;i++)
        num*=x;
    return num;
}

int transfer_string_to_hex(unsigned char *str_name)
{
    char string[]="0123456789ABCDEF";
    int number[]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
    int i = 0;
    int j = 0;
    int str_number = 0;
    for(i=0; i<sizeof(str_name); i++)
    {
        for(j=0; j<sizeof(string); j++)
        {
            if(toupper(str_name<em></em>) == string[j])
            {
                str_number += power(16, (sizeof(str_name)-1-i))* number[j];
                break;
            }
        }
    }
    return str_number;
}

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/* strcat example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char str[80];
  strcpy (str,"these ");
  strcat (str,"strings ");
  strcat (str,"are ");
  strcat (str,"concatenated.");
  puts (str);
  return 0;
}

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/* strstr example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char str[] ="This is a simple string";
  char * pch;
  /* 找尋 simple 字串 */
  pch = strstr (str,"simple");
  /* 將 simple 換成 sample */
  strncpy (pch,"sample",6);
  puts (str);
  return 0;
}

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#include <stdio.h>
#include <stdlib.h>
int count_1_bit_count(unsigned int);
int main(){
    int count = 0, a;
    a = 1023;
    count = count_1_bit_count(a);
    printf("%d有%d個位元為1\n\n", a, count);
    system("pause");
    return 0;
}
int count_1_bit_count(unsigned int n)
{
    int count = 0;
    for(count = 0; n != 0; n >>= 1L)
    {    
        if(n & 0x01)
            count++;
    }    
    return count;
}