tamaño de la comparación de tres cuerdas

#include <cstdio> 
#include <cstring> int principal ( void ) 
{ Char str1 [ 100 ], str2 [ 100 ], str3 [ 100 ]; 
    gets (cadena1); 
    gets (str2); 
    gets (str3); Char s [ 100 ] ;; si (strcmp (cadena1, cadena2)> 0 ) 
    { 
        strcpy (s), str1; 
        strcpy (str1, str2); 
        strcpy (str2, s); 
    } Si (strcmp (cadena1, str3)> 0 ) 
    { 
        strcpy (s), str1; 
        strcpy (str1, str3);


    
    

    

    
    
        strcpy (str3, s); 
    } 
    
    
    Si (strcmp (str2, str3)> 0 ) 
    { 
        strcpy (s), str2; 
        strcpy (str2, str3); 
        strcpy (str3, s); 
    } 
    

    Printf ( " % s \ n " , str3);
    volver  0 ; 
}