Check String for Binary

PROBLEM :

Given a non-empty sequence of characters, return true if sequence is Binary, else return false

Input:

The task is to complete the method that takes a string as argument. We should not read any input from stdin/console. There are multiple test cases. For each test case, this method will be called individually.

Output:
Your function should return true str is binary, else false

Constraints:
1<=T<=50
1<=Length of str<=10000

Example:

Input:
2
101
75

Output:
1
0
     
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SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

// Return true if str is binary, else false

bool isBinary(string &str)
{
   int l ;
   l=str.size() ;
 
   int i ;
   for(i=0;i<l;i++)
    {  
        if((str[i]=='1')||(str[i]=='0'))
            continue ;
        else
            return false ;
    }
           
    return true ;
}

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