From 5626077db16ec75e0b896fe61c239b055abec17a Mon Sep 17 00:00:00 2001
From: smallkun <smallerkun@foxmail.com>
Date: Thu, 6 Mar 2025 17:37:07 +0800
Subject: [PATCH] Auto commit

---
 2208/C语言/指针.md       | 127 +++++++++++++++++++++++++++++++++++++++
 2208/C语言/源码/指针-1.c |  27 +++++++++
 2208/C语言/源码/指针-2.c |  16 +++++
 2208/C语言/源码/指针-3.c |  26 ++++++++
 2208/C语言/源码/指针-4.c |  29 +++++++++
 5 files changed, 225 insertions(+)
 create mode 100644 2208/C语言/指针.md
 create mode 100644 2208/C语言/源码/指针-1.c
 create mode 100644 2208/C语言/源码/指针-2.c
 create mode 100644 2208/C语言/源码/指针-3.c
 create mode 100644 2208/C语言/源码/指针-4.c

diff --git a/2208/C语言/指针.md b/2208/C语言/指针.md
new file mode 100644
index 0000000..5431163
--- /dev/null
+++ b/2208/C语言/指针.md
@@ -0,0 +1,127 @@
+### 地址、指针、指针变量
+
+```c
+#include <stdio.h>
+
+int main(){
+	int a = 1;
+	int* p;//p指针变量 可以用来存储整型变量的地址 
+	double d = .3;
+	//数据类型 变量名;
+	//数据类型* 变量名;
+	//&取地址符
+	printf("&a=%d\n", &a);
+	printf("&d=%d\n", &d);
+	//1.使用指针变量存起来 
+	p = &a;
+	printf("p=%d\n", p);
+	//间接访问符 *
+	//*p <=> a 
+	*p = 10;
+	printf("*p=%d\n", *p);
+	printf("a=%d\n", a);
+	
+	void* jk;
+	jk = &a;
+	printf("%d\n", *(int *)jk);
+	
+	return 0;
+}
+
+```
+
+### 指针与二级指针
+
+```c
+#include <stdio.h>
+
+int main(){
+	int a = 1;
+	int *p;//一级指针 可以指向一个整型变量的地址 
+	int **q; //二级指针 可以指向一个整型指针变量的地址 
+	p = &a;//a的地址 
+	q = &p;//p的地址 
+	
+	printf("a=%d\n", a);
+	printf("*p=%d\n", *p);//*p <=> a
+	printf("**q=%d\n", **q);//*q <=> p  **q <=> a
+
+	return 0;
+}
+
+```
+
+### 指针作为函数形参
+
+```c
+#include <stdio.h>
+/*
+指针与函数 
+1.形参是指针变量
+2.返回值是指针变量 
+*/
+//编写一个函数，传入两个整数/地址，将两个数的值交换 
+//函数在调用过程中 
+void swap(int* a, int* b){//值传递 
+	int t;
+	t = *a;
+	*a = *b;
+	*b = t;//使用中间变量交换两个变量的值
+	printf("swap: %d %d\n", *a, *b); 
+}
+
+int main(){
+	int a, b;
+	a = 1;
+	b = 2;
+	swap(&a, &b);
+	printf("main: %d %d\n", a, b); 
+	
+	return 0;
+}
+
+```
+
+### 指针与一维数组的关系
+
+```c
+#include <stdio.h>
+/*
+	指针与数组的关系
+	
+	指针与一维数组 
+*/
+int main(){
+	
+	int nums[] = {1, 2, 3, 4, 5};
+	//数组在内存中是连续存储 指针变量运算后会得到下一个/前一个 
+	//nums是一个指针 指向自己这个数组的第一个元素 
+	//nums[下标] <=> *(nums+下标)
+	//C语言中只有 *(nums+下标)写法
+	//编译器会将 nums[下标]翻译成上面这种 
+	int *p;
+	p = nums;//nums、p都可以指向该数组的第一个元素
+	//p可以进行赋值运算 但是 nums不行 因为他只是一个虚拟的指针 只能使用* 
+	printf("%d\n", *nums);
+	printf("%d\n", *(nums+1));
+	printf("%d\n", *p++);//1
+	printf("%d\n", *p++);//2
+	printf("%d\n", *p++);//3
+	printf("%d\n", *p++);//4
+	printf("%d\n", *p);//5
+	
+
+	return 0;
+}
+
+```
+
+### 指针实现一维数组的倒置
+
+
+
+### 指针对字符串/数组进行去重
+
+
+
+### 指针实现字符串的替换
\ No newline at end of file
diff --git a/2208/C语言/源码/指针-1.c b/2208/C语言/源码/指针-1.c
new file mode 100644
index 0000000..b0c94c0
--- /dev/null
+++ b/2208/C语言/源码/指针-1.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int main(){
+	int a = 1;
+	int* p;//pָ����� ���������洢���ͱ����ĵ�ַ 
+	double d = .3;
+	//�������� ������;
+	//��������* ������;
+	//&ȡ��ַ��
+	printf("&a=%d\n", &a);
+	printf("&d=%d\n", &d);
+	//1.ʹ��ָ����������� 
+	p = &a;
+	printf("p=%d\n", p);
+	//��ӷ��ʷ� *
+	//*p <=> a 
+	*p = 10;
+	printf("*p=%d\n", *p);
+	printf("a=%d\n", a);
+	
+	void* jk;
+	jk = &a;
+	printf("%d\n", *(int *)jk);
+	
+	return 0;
+}
+
diff --git a/2208/C语言/源码/指针-2.c b/2208/C语言/源码/指针-2.c
new file mode 100644
index 0000000..e20c870
--- /dev/null
+++ b/2208/C语言/源码/指针-2.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main(){
+	int a = 1;
+	int *p;//һ��ָ�� ����ָ��һ�����ͱ����ĵ�ַ 
+	int **q; //����ָ�� ����ָ��һ������ָ������ĵ�ַ 
+	p = &a;//a�ĵ�ַ 
+	q = &p;//p�ĵ�ַ 
+	
+	printf("a=%d\n", a);
+	printf("*p=%d\n", *p);//*p <=> a
+	printf("**q=%d\n", **q);//*q <=> p  **q <=> a
+
+	return 0;
+}
+
diff --git a/2208/C语言/源码/指针-3.c b/2208/C语言/源码/指针-3.c
new file mode 100644
index 0000000..44e0409
--- /dev/null
+++ b/2208/C语言/源码/指针-3.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+/*
+ָ���뺯�� 
+1.�β���ָ�����
+2.����ֵ��ָ����� 
+*/
+//��дһ��������������������/��ַ������������ֵ���� 
+//�����ڵ��ù����� 
+void swap(int* a, int* b){//ֵ���� 
+	int t;
+	t = *a;
+	*a = *b;
+	*b = t;//ʹ���м������������������ֵ
+	printf("swap: %d %d\n", *a, *b); 
+}
+
+int main(){
+	int a, b;
+	a = 1;
+	b = 2;
+	swap(&a, &b);
+	printf("main: %d %d\n", a, b); 
+	
+	return 0;
+}
+
diff --git a/2208/C语言/源码/指针-4.c b/2208/C语言/源码/指针-4.c
new file mode 100644
index 0000000..d5c5c9a
--- /dev/null
+++ b/2208/C语言/源码/指针-4.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+/*
+	ָ��������Ĺ�ϵ
+	
+	ָ����һά���� 
+*/
+int main(){
+	
+	int nums[] = {1, 2, 3, 4, 5};
+	//�������ڴ����������洢 ָ�����������õ���һ��/ǰһ�� 
+	//nums��һ��ָ�� ָ���Լ��������ĵ�һ��Ԫ�� 
+	//nums[�±�] <=> *(nums+�±�)
+	//C������ֻ�� *(nums+�±�)д��
+	//�������Ὣ nums[�±�]������������� 
+	int *p;
+	p = nums;//nums��p������ָ�������ĵ�һ��Ԫ��
+	//p���Խ��и�ֵ���� ���� nums���� ��Ϊ��ֻ��һ�������ָ�� ֻ��ʹ��* 
+	printf("%d\n", *nums);
+	printf("%d\n", *(nums+1));
+	printf("%d\n", *p++);//1
+	printf("%d\n", *p++);//2
+	printf("%d\n", *p++);//3
+	printf("%d\n", *p++);//4
+	printf("%d\n", *p);//5
+	
+
+	return 0;
+}
+