【C语言】一些指针笔试题解析

简单不先于复杂，而是在复杂之后。

目录

 1. 笔试题 1

2. 笔试题 2 

3. 笔试题 3 

4. 笔试题 4 

5. 笔试题 5 

 6. 笔试题 6

 7. 笔试题 7

8. 笔试题 8 

---

 

 1. 笔试题 1

 

#define _CRT_SECURE_NO_WARNINGS 1
#include

int main()
{
	int a[5] = { 1, 2, 3, 4, 5 };
	int* ptr = (int*)(&a + 1);
	printf("%d,%d", *(a + 1), *(ptr - 1));

	return 0;
}

 

 

2. 笔试题 2 

 

#define _CRT_SECURE_NO_WARNINGS 1
#include

struct Test
{
	int Num;
	char* pcName;
	short sDate;
	char cha[2];
	short sBa[4];
}* p = (struct Test*)0x100000;

//假设p 的值为0x100000。 如下表表达式的值分别为多少？
//已知，结构体Test类型的变量大小是20个字节
//x86

int main()
{
	printf("%p\n", p + 0x1);
	printf("%p\n", (unsigned long)p + 0x1);
	printf("%p\n", (unsigned int*)p + 0x1);

	return 0;
}

 

3. 笔试题 3 

 

#define _CRT_SECURE_NO_WARNINGS 1
#include

int main()
{
	int a[4] = { 1, 2, 3, 4 };
	int* ptr1 = (int*)(&a + 1);
	int* ptr2 = (int*)((int)a + 1);

	printf("%x,%x", ptr1[-1], *ptr2);
	
	return 0;
}

 

 

4. 笔试题 4 

 

#define _CRT_SECURE_NO_WARNINGS 1
#include

int main()
{
	int a[3][2] = { (0, 1), (2, 3), (4, 5) };
	int* p;
	p = a[0];

	printf("%d", p[0]);

	return 0;
}

 

 

5. 笔试题 5 

 

#define _CRT_SECURE_NO_WARNINGS 1
#include

int main()
{
	int a[5][5];
	int(*p)[4];
	p = a;

	printf("%p,%d\n", &p[4][2] - &a[4][2], &p[4][2] - &a[4][2]);

	return 0;
}

 

 6. 笔试题 6

 

#define _CRT_SECURE_NO_WARNINGS 1
#include

int main()
{
	int aa[2][5] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
	int* ptr1 = (int*)(&aa + 1);
	int* ptr2 = (int*)(*(aa + 1));
	printf("%d,%d", *(ptr1 - 1), *(ptr2 - 1));
	return 0;
}

 

 

 7. 笔试题 7

 

 

#define _CRT_SECURE_NO_WARNINGS 1
#include

int main()
{
	char* a[] = { "work","at","alibaba" };
	char** pa = a;
	pa++;

	printf("%s\n", *pa);

	return 0;
}

 

 

8. 笔试题 8 

 

 

#define _CRT_SECURE_NO_WARNINGS 1
#include

int main()
{
	char* c[] = { "ENTER","NEW","POINT","FIRST" };
	char** cp[] = { c + 3,c + 2,c + 1,c };
	char*** cpp = cp;

	printf("%s\n", **++cpp);
	printf("%s\n", *-- * ++cpp + 3);
	printf("%s\n", *cpp[-2] + 3);
	printf("%s\n", cpp[-1][-1] + 1);

	return 0;
}