Nearly right.

Instead of 
  scanf("%c",&c)
put a space in the " %c". The space makes the scanf match zero or more white 
space characters, which will consume stray end-of-line characters.

In the final
   char str[5]={r1,r2,r3,r4,r5};
   //cout<<str<<endl;
   printf("%s\n", str); 
make sure the str is a properly terminated string. So write
   char str[6]={r1,r2,r3,r4,r5,0};
   //cout<<str<<endl;
   printf("%s\n", str); 

Did you run your code with the Google python scripts?
With those scripts you can write to stderr (as long as it isn't too much) and 
debug that way.

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