部分同学用的是Visual Studio。为了解决scanf函数在vs中报错的问题,需要在你的源文件第一行放这行代码(文章最后有完整代码)

#define _CRT_SECURE_NO_WARNINGS 1

顺序表的代码实现

1.顺序表的定义

定义结构体类型;结构体外面的typedef int SLDataType:用typedef声名int类型,是为了方便修改结构体中的存放的数据类型。

typedef int SLDataType;
typedef struct SeqList
{
	SLDataType* a;
	int size;//数组中存储的数据个数
	int capacity;//表示最大容量

}SL;

注:定义结构体变量,后面全部代码的传值调用传址调用一定要注意要区分开来:例如:

	SL sl;//定义结构体变量
    SeqListPopFront(&sl);

2.顺序表的初始化

void SeqListInit(SL* ps)
{
	ps->a = NULL;
	ps->size = ps->capacity = 0;
}

3.检查增容

注意,这里传址调用,所以这里的传入的参数为SL*ps

ps->size == ps->capacity:如果最大容量和存储数据相同(表示整个顺序表没有空间或者初始化都为0,则需要扩容;其他情况就不用扩容)

int newcapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;三目运算符用法(如果最大容量为0那么新的容量就为4否则新容量就为老容量的两倍)

realloc动态内存申请函数

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<assert.h>


//检查增容
void SeqListCheckCapacity(SL* ps)
{

	if (ps->size == ps->capacity)
	{
		int newcapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;
		SLDataType* tmp = (SLDataType*)realloc(ps->a, newcapacity * sizeof(SLDataType));
		if (tmp == NULL)
		{
			printf("realloc fail\n");
			exit(-1);
		}
		ps->a = tmp;
		ps->capacity = newcapacity;
	}
}

4.销毁顺序表

void SeqListDestory(SL* ps)
{
	free(ps->a);
	ps->a = NULL;
	ps->size = ps->capacity = 0;
}

5尾插入元素

//尾插
void SeqListPushBack(SL* ps, SLDataType x)
{
	SeqListCheckCapacity(ps);//检查容量,自动扩容
	//若空间足够可直接插入数据即可
	ps->a[ps->size] = x;
	ps->size++;

	
}

6.尾删除元素


void SeqListPopBack(SL* ps)
{
	assert(ps->size > 0);
		ps->size--;

}

7.头插入元素

void SeqListPushFront(SL* ps, SLDataType x)
{
	//检查增容
    SeqListCheckCapacity(ps);
	//挪动数据
	int end = ps->size - 1;
	while (end >= 0)
	{
		ps->a[end + 1] = ps->a[end];
		--end;
	}
	ps->a[0] = x;
	ps->size++;
}

8.头删除元素

void SeqListPopFront(SL* ps)
{
	assert(ps->size > 0);
	int begin = 1;
	while (begin < ps->size)
	{
		ps->a[begin - 1] = ps->a[begin];
		begin++;
	}
	ps->size--;
}

9.打印元素

void SeqListPrint(SL* ps)
{
	for (int i = 0; i < ps->size; i++)
	{
		printf("%d ", ps->a[i]);
	}
	printf("\n");
}

10.查找元素返回下标

//找到了返回x位置下标,没找到返回-1
int SeqListFind(SL* ps, SLDataType x)
{
	for (int i = 0; i < ps->size; i++)
	{
		if (ps->a[i] == x)
		{
			return i;
		}
	}

	return -1;
}

11.指定pos下标进行位置插入

//指定pos下标位置插入
void SeqListInsert(SL* ps, int pos, SLDataType x)
{
	assert(pos <= ps->size && pos >= 0);
	SeqListCheckCapacity(ps);
	//挪动数据
	int end = ps->size - 1;
	while (end >= pos)
	{
		ps->a[end + 1] = ps->a[end];
		--end;
	}
	ps->a[pos] = x;
	ps->size++;

}

12.删除pos位置的数据

void SeqListErase(SL* ps, int pos)
{
	assert(pos >= 0 && pos < ps->size);
	int begin = pos;
	while (begin < ps->size - 1)
	{
		ps->a[begin] = ps->a[begin + 1];
		begin++;
	}
	ps->size--;
}

全部代码

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<assert.h>

typedef int SLDataType;
typedef struct SeqList
{
	SLDataType* a;
	int size;//数组中存储的数据个数
	int capacity;//表示最大容量

}SL;
void SeqListPrint(SL* ps)
{
	for (int i = 0; i < ps->size; i++)
	{
		printf("%d ", ps->a[i]);
	}
	printf("\n");
}
void SeqListInit(SL* ps)
{
	ps->a = NULL;
	ps->size = ps->capacity = 0;
}

//检查增容
void SeqListCheckCapacity(SL* ps)
{


	if (ps->size == ps->capacity)
	{
		int newcapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;
		SLDataType* tmp = (SLDataType*)realloc(ps->a, newcapacity * sizeof(SLDataType));
		if (tmp == NULL)
		{
			printf("realloc fail\n");
			exit(-1);
		}
		ps->a = tmp;
		ps->capacity = newcapacity;
	}
}

void SeqListDestory(SL* ps)
{
	free(ps->a);
	ps->a = NULL;
	ps->size = ps->capacity = 0;
}

//尾插
void SeqListPushBack(SL* ps, SLDataType x)
{
	SeqListCheckCapacity(ps);
	//3.空间足够,直接插入数据即可
	ps->a[ps->size] = x;
	ps->size++;

	//SeqListInsert(ps, ps->size, x);

}

//尾删
void SeqListPopBack(SL* ps)
{

	
	assert(ps->size > 0);
		ps->size--;

	//SeqListErase(ps, ps->size - 1);

}

//头插
void SeqListPushFront(SL* ps, SLDataType x)
{
	//检查增容
    SeqListCheckCapacity(ps);

	//挪动数据
	int end = ps->size - 1;
	while (end >= 0)
	{
		ps->a[end + 1] = ps->a[end];
		--end;
	}
	ps->a[0] = x;
	ps->size++;

	//SeqListInsert(ps, 0, x);

}

//头删
void SeqListPopFront(SL* ps)
{
	assert(ps->size > 0);
	//挪动数据
	int begin = 1;
	while (begin < ps->size)
	{
		ps->a[begin - 1] = ps->a[begin];
		begin++;
	}
	ps->size--;
	//SeqListErase(ps, 0);
}


//找到了返回x位置下标,没找到返回-1
int SeqListFind(SL* ps, SLDataType x)
{
	for (int i = 0; i < ps->size; i++)
	{
		if (ps->a[i] == x)
		{
			return i;
		}
	}

	return -1;
}

//指定pos下标位置插入
void SeqListInsert(SL* ps, int pos, SLDataType x)
{

	assert(pos <= ps->size && pos >= 0);
	SeqListCheckCapacity(ps);
	//挪动数据
	int end = ps->size - 1;
	while (end >= pos)
	{
		ps->a[end + 1] = ps->a[end];
		--end;
	}
	ps->a[pos] = x;
	ps->size++;

}

//删除pos位置的数据
void SeqListErase(SL* ps, int pos)
{
	assert(pos >= 0 && pos < ps->size);
	int begin = pos;
	while (begin < ps->size - 1)
	{
		ps->a[begin] = ps->a[begin + 1];
		begin++;
	}
	ps->size--;
}


void TestSeqList1()
{
	SL sl;
	//初始化
	SeqListInit(&sl);

	printf("这是第1组数据  ");
	SeqListPushBack(&sl, 1);
	SeqListPushBack(&sl, 2);
	SeqListPushBack(&sl, 3);
	SeqListPushBack(&sl, 4);
	SeqListPushBack(&sl, 5);
	SeqListPrint(&sl);


	printf("这是第2组数据  ");
	SeqListPopBack(&sl);
	SeqListPopBack(&sl);
	SeqListPopBack(&sl);
	SeqListPushBack(&sl, 4);
	SeqListPushBack(&sl, 4);
	SeqListPrint(&sl);
	
	printf("这是第3组数据  ");
	//元素查找函数,返回下标
	int pos = SeqListFind(&sl, 4);
	if (pos != -1)
	{
		//指定pos下标进行位置插入
		SeqListInsert(&sl, pos, 40);
	}
	SeqListPrint(&sl);


	printf("这是第4组数据  ");
	SeqListInsert(&sl, 0, -1);
	SeqListPrint(&sl);

	printf("这是第5组数据  ");
	//元素查找,返回下标
	int find = SeqListFind(&sl, 99);
	printf("find=%d", find);

	SeqListDestory(&sl);
}




void Menu()
{
	printf("**********************************\n");
	printf("     请选择你的操作:>\n");
	printf("1,头插             2,头删\n");
	printf("3,尾插             4,尾删\n");
	printf("5,打印            -1,退出\n");
	printf("**********************************\n");
}
void MenuTest()
{
	SL sl;
	SeqListInit(&sl);
	int input = 0;
	int x;
	while (input != -1)
	{
		Menu();
		scanf("%d", &input);
		switch (input)
		{
		case 1:
			printf("请输入你要头插的数据,以-1结束\n");
			scanf("%d", &x);
			while (x != -1)
			{
				SeqListPushFront(&sl, x);
				scanf("%d", &x);

			}

			break;
		case 2:
			printf("头删\n");

			SeqListPopFront(&sl);
			break;

		case 3:
			printf("请输入你要尾插的数据,以-1结束\n");
			scanf("%d", &x);
			while (x != -1)
			{
				SeqListPushBack(&sl, x);
				scanf("%d", &x);

			}
			break;

		case 4:
			printf("尾删\n");

			SeqListPopBack(&sl);

			break;

		case 5:
			SeqListPrint(&sl);
			break;

		case 6:
			break;

		default:
			printf("无此选项,请重新输入\n");
			break;
		}
	}
	SeqListDestory(&sl);

}


int main()
{
	//(删除pos位置的数据;   指定pos下标位置插入;  找到了返回x位置下标,没找到返回-1)这三个函数可以自己测试添加
	//TestSeqList1();//这里大家自行尝试调试,
	MenuTest();
	return 0;
}

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