Convert 0x8002c2f2 as 128.2.194.242

#include  <stdlib.h>
#include < stdio.h>
#include <limits.h >
#include <string.h >

/*
    Convert  0x8002c2f2 as 128.2.194.242  
*/

int main( int argc, char ** argv)
{    
    if(argc !=  2){
        fprintf(stderr,"usage: %s <hex ip address> ",argv[0]);
        return  0 ;
    }
    
    char  *endp = 0; 
    char * input  = argv[1];    
    unsigned long   hexAddr = strtoul(input,&endp, 16);    
    
    if( * endp != '\0 ')
    {
        printf("%s%s" ,"You have inputted is not Hex values:" ,input);
        return 0;                                                                                                                                
    }
    // checking overflow
    // if( hexAddr == ULONG_MAX && *endp != '\0' )
//    {
//         printf("%s","Overflow exception! The max item is 0xFFFFFFFF");
//        return 0;                                                                                                                    
//    }  
 
     int i;
    int unit;
    for (i=3; i >=  0 ; i--)
    {            
        unit  = (hexAddr >>  8*i) &  0xff;
        if(0  == i)
            printf("%d ", (int)unit);
        else
            printf("%d.", ( int)unit);
    }
    return 0  ;
}

--
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