线性表①

#include<stdio.h>
#define SIZE 100//最大字节
enum BOOL {ERROR,OK};
typedef struct {
    char data[SIZE];
    int last;
}sqlist;
void initial(sqlist &);    //初始化线性表
BOOL insert(sqlist &, int, char); //在线性表中插入元素
BOOL del(sqlist&, int, char &);   //在线性表中删除元素
int locate(sqlist, char);        //在线性表中定位元素
void show(sqlist);
void main()
{

    int loc,flag,k;
    char ch;
    sqlist s;
    while (1) {
        scanf("%d",&k);
        switch (k)
        {case 1:
            initial(s);
            show(s); break;
        case 2:
            scanf("%d %c", &loc, &ch);
            insert(s, loc, ch);
            show(s);
            break;
        case 3:
            scanf("%d", &loc);
            del(s, loc, ch);
            show(s);
            printf("%c", ch); getchar();
            break;
        case 4:
            
            scanf("%c", &ch);
            flag = locate(s, ch);
            printf("%d", flag);
            break;
        }
    }
}
BOOL insert(sqlist &s, int loc, char c)
{
    int i;

    if (loc<1 && loc>s.last + 1)
    {
        printf("error"); return ERROR;
    }
    else if (s.last > SIZE)//线性表已满
    {
        printf("s.last is out MAX"); return ERROR;
    }
    else{
        for (i = s.last-1; i>=loc-1; i--)
        {
            s.data[i + 1] = s.data[i];
        
        }
        s.data[loc-1] = c;
        s.last++;
        return OK;
    }

}
int locate(sqlist s, char ch)
{
    char c;
    c = ch;
    int i;
    for (i = 0; i < s.last; i++)
    {
        if (s.data[i] == c)return i + 1;
    }
    if (i > s.last)return ERROR;
}
BOOL del(sqlist &s,int loc ,char &ch)
{
    
    if (loc > s.last + 1 && loc < 1)return ERROR;
    ch = s.data[loc - 1];
    int i;
    for (i = loc - 1; i <= s.last - 1; i++)s.data[i] = s.data[i + 1];//向左移动
    s.data[i] = '\0';
    s.last--;
    return OK;
    
}
void initial(sqlist &s)
{
    int i;
    printf("请输入初始化线性表长度\n");
    scanf("%d",&s.last);
    printf("输入第1个到第%d个字符\n", s.last);
    getchar();
    for (i = 0; i<s.last; i++) scanf("%c", &s.data[i]); //输入线性表的各元素
}
void show(sqlist s)     //显示当前线性表所有元素
{
    int i;
    for (i = 0; i<s.last; i++) printf("%c ", s.data[i]);
    printf("\n");
}