atoi() not giving correct answer

[iqra123]

hii

i m using atoi() to convert char value to int. and then passing that int as a swtich variable.

switch goes in a case and exectuing that particualr function but returning 0 value....

for example: i am finding no of process() and system up time().
when switch program goes in system up time it gives right values means correct no of days, hrs , min and sec but when it goes in no of process() it gives 0 answer....

why is it so???? plz help!!

int snmpget()
{
char recv_data[1024];
// code to recieve msgs from client
          bytes_read = recvfrom(sock,recv_data,1024,0,
          (struct sockaddr *)&client_addr, &addr_len);
 
 
      recv_data[bytes_read] = '\0';
    printf("\n(%s , %d) requested :                       \n",inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port));
         printf("%s", &recv_data);
      fflush(stdout);
 
  int i=atoi(recv_data); // converting recv_data into integer
 
    switch(i)
    {
    case 1:    
        systm_time();
        break;
    case 2:
        no_of_process();
        break;
    default:
        printf("\tINCORRECT VALUE");
        break;
    }
 
}    
 //  this function is printing right values for hrs, min, sec, and days
    int systm_time()
        {    
        char send_data[1024];
        if(sysinfo(&sys_info) != 0)
            perror("sysinfo");
 
          // Uptime
          days = sys_info.uptime / 86400;
          hours = (sys_info.uptime / 3600) - (days * 24);
          mins = (sys_info.uptime / 60) - (days * 1440) - (hours * 60);
 
          printf("Uptime: %ddays, %dhours, %dminutes, %ldseconds\n",
                              days, hours, mins, sys_info.uptime % 60);
 
        }    
// this functions is returning 0
int no_of_process()
    {
         // Number of processes currently running.
          printf("Number of processes: %d\n", sys_info.procs);
 
    }

[weaknessforcats]

int i=atoi(recv_data); // converting recv_data into integer 

This is converting recv_data[0] to an int. Is that your intent?

If recv_data is a string to convert ot an int, then you use strtol.

BTW: A char is an integer. Therefore, there is no need to convert a char to an int for a switch. You can just use the char directly for the cases of the switch.

[iqra123]

thanx for ur reply...
my prob is solved. there was nothing wrong in atoi().

i was missing 2lines code in no_of_process().
that was creating prob.

:-)
Regards!

[johny10151981]

@weaknessforcats
Even though the problem is solved. I need to as a question to weaknessforcats

int i=atoi(recv_data); // converting recv_data into integer 

why above code will work only on
recv_data[0]. Its not clear to me. From knowledge and understanding atoi function was suppose to work until it finds '\0' i.e. end of string character.
Besides if it was suppose to work only on one byte compiler would generate an error message.

Please let me know.
Best Regards,
Johny

[Banfa]

The function atoi converts a C string (a NULL terminated series of printable characters in the execution character set) of digits into its corresponding int value.

It discards any leading white space and then converts as many characters as it can stopping only when it finds a non digit character.

[iqra123]

@ johny10151981

well in recv_data we are geting data from client. it recieves string from client. its just a char array that stores messge from client side..


well there was nothing wrong with atoi().. :-) i was doing a mistake in another function.

Regards!