c语言中指针数组赋值字符串,C语言—用结构体指针给数组赋值（结构体指针指向字符串，给字符串赋值）...
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 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 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 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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