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Solved

Differentiating cin >> streams

Posted on 2004-03-28
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Last Modified: 2010-04-17
I'm trying to design a command line for a mock up OS simulation. I am having trouble designing the command line. What I originally tried is this:

char a[10];
char b[10];
char c[10];
int d;
int e;

while (a != quit){
 if (cin >> a){
   cout << "This is a quit command";
 else if (cin >> a >> b){
  cout << "This is a command plus a file name";
 else if (cin >> a >> b >> c >> d >> e){
  cout << "This will create the files with parameters";
}

when I run this, I can only see the first if statement regardless of how many strings I put in.

Any help,
Don
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Comment
Question by:ddoan
  • 2
4 Comments
 
LVL 3

Expert Comment

by:pamboo
ID: 10702440
cin >> a will always return true regardless of how many strings u give .

So , ur first if statment will occur always .

U can just use only one input variable say a of max length
say, char a[100]

Use strtok to get vlaues seperated .

P.S: I will try to post the modified code soon

- Rajan



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LVL 3

Accepted Solution

by:
pamboo earned 50 total points
ID: 10702963
#include <iostream.h>
#include <string>

using namespace std;

void main()
{

  char inputBuffer[100];
  char a[10];

  char b[10];
  char c[10];
  int d;
  int e;

  int quit=1;

  char *ptr;
  int argc;

  while (quit)
  {
 
   argc = 0;  

   cin.getline(inputBuffer,100,'\n');

   ptr = strtok(inputBuffer," ");

   while(ptr)
   {           
      
       if (argc==0) strcpy(a,ptr);
       if (argc==1) strcpy(b,ptr);
       if (argc==2) strcpy(c,ptr);
       if (argc==3) d=atoi(ptr);
       if (argc==4) e=atoi(ptr);
        
       ptr = strtok(NULL," ");           
       argc++;
      
   }  
   
   if (argc==1)
   {
      cout << "This is a quit command" <<endl;
        cout << a << endl ;
        quit =0 ;
   }
   
   if (argc==3)
   {
     cout << "This is a command plus a file name" <<endl;
       cout << a << endl << b << endl << c << endl ;
   }
   
   if (argc==5)
   {
     cout << "This will create the files with parameters" <<endl ;
       cout << a << endl << b << endl << c << endl << d << endl << e << endl ;
   }
   
     
  }

}

- Rajan
0

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