How to compare two "chars"

[aloz]

Hi, I'm trying to compare two chars, one of those entered by the user.. if the person enters "si" it will transform to uppercase and then make the comparison.. unfortunately when I run the code it doesn't take them as similar.

Thanks

#include <stdio.h>
#include <ctype.h>
#include <conio>
#include <iostream>

int main()
{
   int i = 0;
   char str[5];

   cin>>str;

   while(str[i])
   {
      str[i] = toupper(str[i]);
      i++;
   }

   cout<<str;

   if(str == "SI")
   {
      cout<<"It's equal.";
   }

   getch();
   return 0;
}

[Thomas1965]

You can't compare char arrays with ==
You need to use strcmp or even better stricmp.
http://www.cplusplus.com/reference/cstring/strcmp/
http://www.ibm.com/support/knowledgecenter/ssw_ibm_i_73/rtref/stricmp.htm

[shadder]

Here's a tweak to your code

#include <iostream>
#include <stdio.h>
#include <ctype.h>
#include <string.h>

using namespace std;

int main()
{
   int i = 0;
   char str[5];

   cin>>str;

   while(str[i])
   {
      str[i] = toupper(str[i]);
      i++;
   }

   cout<<str<<endl;

   if(strcmp("SI",str)==0)
   {
      cout<<"It's equal.";
   }

   
   return 0;
}

PS: It seems like you are using a old compiler (because of conio)...

[aloz]

Thanks!

[shadder]

Welcome :)