C语言 实现将16进制数转成10进制数

int main(int argc, char *argv[])
{hextoDec(0xffff);return 0;
}void hextoDec(int hex){int sum=0,mul=1;int i,r;int count=0;do{r=hex%16;for(i=0;i<count;i++)mul*=16;mul*=r;sum+=mul;mul=1;count++; }while(hex/=16);printf("%d\n",sum);}