下面这个结构，每一行都表示什么呀？ 网上找了好久，都没有找到解释，麻烦高人们解释一下嘛：每一行定义代表什么？ 不胜感激！！ // Registers : I/O port #define IOP_BASE      0xB1600000   //0x56000000 typedef struct  {     unsigned int  rGPACON;   //00     unsigned int  rGPADAT;     unsigned int  rPAD1[2];     unsigned int  rGPBCON;   //10     unsigned int  rGPBDAT;     unsigned int  rGPBUP;     unsigned int  rPAD2;     unsigned int  rGPCCON;   //20     unsigned int  rGPCDAT;     unsigned int  rGPCUP;     unsigned int  rPAD3;     unsigned int  rGPDCON;   //30     unsigned int  rGPDDAT;     unsigned int  rGPDUP;     unsigned int  rPAD4;     unsigned int  rGPECON;   //40     unsigned int  rGPEDAT;     unsigned int  rGPEUP;     unsigned int  rPAD5;     unsigned int  rGPFCON;   //50     unsigned int  rGPFDAT;     unsigned int  rGPFUP;     unsigned int  rPAD6;     unsigned int  rGPGCON;   //60     unsigned int  rGPGDAT;     unsigned int  rGPGUP;     unsigned int  rPAD7;     unsigned int  rGPHCON;   //70     unsigned int  rGPHDAT;     unsigned int  rGPHUP;     unsigned int  rPAD8;     unsigned int  rMISCCR;   //80     unsigned int  rDCKCON;     unsigned int  rEXTINT0;     unsigned int  rEXTINT1;     unsigned int  rEXTINT2;   //90     unsigned int  rEINTFLT0;     unsigned int  rEINTFLT1;     unsigned int  rEINTFLT2;     unsigned int  rEINTFLT3;  //A0     unsigned int  rEINTMASK;     unsigned int  rEINTPEND;     unsigned int  rGSTATUS0;  //AC     unsigned int  rGSTATUS1;  //B0     unsigned int  rGSTATUS2;  //B4     unsigned int  rGSTATUS3;  //B8     unsigned int  rGSTATUS4;  //BC }IOPreg;