數組定義：

char acBuf[sizeof(TRANS_HEAD_S) + sizeof(USER_HEAD_S) + 4] = {0};

結構體定義：? ? ? ? ? ? ??

typedef struct {int iOne;int iTwo;int iThr; }TRANS_HEAD_S;typedef struct {int iUser; }USER_HEAD_S;

1、實現結果：

acBuf[0] = 11 acBuf[1] = 0 acBuf[2] = 0 acBuf[3] = 0 acBuf[4] = 12 acBuf[5] = 0 acBuf[6] = 0 acBuf[7] = 0 acBuf[8] = 13 acBuf[9] = 0 acBuf[10] = 0 acBuf[11] = 0 acBuf[12] = 14 acBuf[13] = 0 acBuf[14] = 0 acBuf[15] = 0 acBuf[16] = 15 acBuf[17] = 0 acBuf[18] = 0 acBuf[19] = 0

2、代碼實現：

#include <stdio.h>typedef struct {int iOne;int iTwo;int iThr; }TRANS_HEAD_S;typedef struct {int iUser; }USER_HEAD_S;int main() {char acBuf[sizeof(TRANS_HEAD_S) + sizeof(USER_HEAD_S) + 4] = {0};TRANS_HEAD_S *pstTransHead = NULL;USER_HEAD_S *pstUserHead = NULL;int i=0; int *pValue = NULL;/*pstTransHead指針指向了acBuf的頭*/pstTransHead = (TRANS_HEAD_S *)acBuf;pstTransHead->iOne = 11;pstTransHead->iTwo = 12;pstTransHead->iThr = 13;/*pstUserHead指向了acBuf的第13個字節的頭，因為結構體TRANS_HEAD_S是12字節*/pstUserHead = (USER_HEAD_S *)&pstTransHead[1];pstUserHead->iUser = 14;/*pValue指向了acBuf的第17個字節的頭，因為結構體TRANS_HEAD_S是12字節，USER_HEAD_S是4個字節*/pValue = (int *)&pstUserHead[1];(*pValue) = 15;for(i = 0; i < sizeof(acBuf); i++){printf("acBuf[%d] = %d\n", i, acBuf[i]);}return 0; }

3、對代碼【pstUserHead = (USER_HEAD_S *)&pstTransHead[1];】

? ? ?的解釋——結構體賦值給另一個結構體

#include <stdio.h>typedef struct {int iA;int iB;int iC; }TEST_S;int main(void) {TEST_S t1,t2;/*給t1結構體賦值*/ t1.iA = 11;t1.iB = 12;t1.iC = 13;/*t1結構體賦值給t2結構體*/t2 = t1;printf("t2.iA=%d t2.iB=%d t2.iC=%d\n", t2.iA, t2.iB, t2.iC);return 0; }

?結果顯示：t2.iA=11 t2.iB=12 t2.iC=13

4、char類型指針指向int類型數值,取值結果顯示

#include <stdio.h>int main() {int i = 1561;char c = 0;c = (char)i;printf("i=%d c=%hhu\n", i, c);return 0; }

結果顯示是：i=1561 c=25

1561：是

25：是

?

總結

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