I want to use a integer to save the ip address of ipv4. Because they all are
4 bytes.

but it is better when the data type is unsigned int.

How to create a data of unsigned int?
1334
1335     // tcp->gate_addr[0]是地址的高8位
1336     for ( i=0, m=1; i<4; i++, m*=0x100 ) 
1337         gateaddr = gateaddr + tcp->gate_addr[3-i] * m;
1338 

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