max_int和-1

#include <stdio.h>                      
int main(int argc, char *argv[])        
{                                       
    unsigned int umax=~0;               
    if(umax == -1)                      
        printf("umax:%u == -1\n",umax); 
    if((unsigned)4294967295 == -1)      
        printf("wow \n");               
                                        
                                        
    return 0;                           
}