#include <unistd.h>
      #include <fcntl.h>
      #include <sys/ioctl.h>
      #include <stdio.h>
      #include <linux/i2c.h>
      #define LM75 72  // ! Linux remove the R/W-Bit from Adress ! 
            int main(int argc,char** argv) {
          int f = open("/dev/i2c/0",O_RDWR);
          char buf[2];
          if (f>0) {
              ioctl(f,I2C_SLAVE,LM75);
              if (-1 == read(f,buf,2)) {
                  printf("read error.\n");
              } else { /* calc. temparature*/
                  int temp = buf[0]*256+buf[1];
                  temp >>=7;
                  if (temp>512)
                      temp &= -1;
                  printf("%g Grad Celsius\n", (float)temp/2.0);
              }
          }
          return close(f);
      }