点分十进制与整型之间的转换

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#include<stdio.h>
int a2dt(const char* str)
{
    int a;
    unsigned char* ap=  (unsigned char*)&a;
    sscanf(str,"%d.%d.%d.%d",ap,ap+1,ap+2,ap+3);
    return a;
}

char * dt2a(int a)
{
    char *s = new char[14];
    unsigned char* ap=  (unsigned char*)&a;
    sprintf(s,"%u.%u.%u.%u",ap[0],ap[1],ap[2],ap[3]);
    return s;
}
int main()
{
    unsigned int a = a2dt("8.7.6.5");
    char * ap = dt2a(a);
    printf("%0p\n",a);
    printf("%s\n",ap);
    return 0;
}

来源：oschina

链接：https://my.oschina.net/u/3695598/blog/3151272