how to do this using string array

[satekazumi]

Hello,

i wan to do c++ program in ubuntu that able to write a summary on the directory example is

drwx-x John 4096
d-w--x John 14
lrwx-x John 2300

How to i use array to put per column into array then access them so i can generate a report so it will be like this

Summary
Total directories = 2 ( the number of d in front determine it)
total link files = 1 ( the number of l in front determine it)
Name of user = John
Total size = 6410 (the total size of last column)

for now is i using char to determine the directories and link file

int main()
{
char input[100]
int directory = 0;

while(cin>>input)
{
if(input[0] == 'd')
directory++;
}
cout<<dir<<endl;
}

this is what i done to find the directories and link, but i cant use char method to grab name and calculate total size...anyone can tell me any method to generate the report...ty for all help

[Zaita]

http://www.cplusplus.com/forum/articles/1295/

[kevinchkin]

This is probably the sloppiest code I've ever written, I am sure this code can be written in much more elegant manner. I wrote it in 10 min just to give you some idea as to what you have to do.

#include<iostream>
#include<cstring>

using namespace std;

int main() {

char* str[3][1] = {{"dwr--x-x John 2030"},{"d--x-x John 1000"},{"lwr-x-x John 200"}};
char *p;
int dir_count = 0;
int link_count = 0;
char name[50];
int total_size = 0;

for (int i=0,j=0;i<3;i++) {

char getval[100];
strcpy (getval,str[i][j]);
p = strtok (getval," ");

int flag = 0;
while (p!=NULL ) {

   if (flag == 0) {
   char temp;
   temp = *p;
   switch (temp) {
   case 'd':
        dir_count++;
        break;
   case 'l':
         link_count++;
         break;

    }
   }

   else if (flag == 1) {

        strcpy(name, p);      

   }
   else if (flag == 2) {
          total_size += atoi(p);      
   }
   p = strtok(NULL, " "); 
   flag ++;
}
}

cout<<"Total Directories:"<<dir_count<<endl;
cout<<"Total Linked file:"<<link_count<<endl;
cout<<"User Name:"<<name<<endl;
cout<<"Total Size:"<<total_size<<endl;

return 0;

 }

Hope this helps !

[satekazumi]

ty for the help kevinchkin

I noticed your code is the string stored into array then do the manipulation, is it possible to get the string from input itself?

[kevinchkin]

Of course,

char str[100]; 
cin.getline(str); 

after this just replace all the brackets for str from the previous code.

[satekazumi]

so in the end, we not using the 2d array and replace it with

char str[100]; 
cin.getline(str); 

[kevinchkin]

Well ya, if you want to input the string then you don't need a 2-d array. You can just compute everything on the fly.

[Zaita]

If your going to use cin.getline(), make sure you specify a maximum limit. Otherwise your going to create a cascading buffer-overflow through your application. Especially as you have used functions such as strcpy() that do no bounds-checking.

Have a read through:
http://www.cplusplus.com/forum/articles/6046/
It'll give you a good idea of how to read information from streams (files, memory or stdin).

[satekazumi]

kevin,i wanna ask you, for these piece of code , it could only read the first letter of its flag becos of the string token, may i know wat shld i do if i want to read the second letter or other letter of that flag .

 if (flag == 0) {
   char temp;
   temp = *p;
   switch (temp) {
   case 'd':
        dir_count++;
        break;
   case 'l':
         link_count++;
         break;

    }

[kevinchkin]

Hey! Sorry for not replying for so long. Anyways if you'll just use
p instead of temp = *p
(Of course, considering you are not assigning this value to temp)
You'll get entire string. And if you want to access other characters in that string then just do p[index]
So, the code can be rewritten as:

int (flag ==0) { 

switch (p[0]) { 

case 'd': 
    dir_count++; 
    break; 
case 'l': 
    link_count++; 
    break; 
}

Now p will have entire string, and to access individual characters in the string just use p[index]. Make sure that index is within the string length, otherwise it will return a garbage value, since C does not do array bound checking.
Hope this helps.