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小型Basic编译器问题

2024-07-07 13:29:22   232人阅读

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# include <stdio.h>
# include <string.h>
# include <ctype.h>
# include <stdlib.h>
# include <map>
//使用map解决一对一 的关系
using namespace std;
map<char,long> mapdata;
 
//数据存储
typedef struct node
{
    long num;
    char ch1[20];
    char ch2[20];
}LINK;
LINK arry[101];
 
//存储已定义的变量
struct data
{
    char st[100];
    int top;
}p;
 
int main()
{
    long a,i=0,length,temp;
    char str1[20],str2[20];
    char ch;
    long k,t;
    char temp1[20];
 
    //数据输入
    while(scanf("%ld",&a) != EOF)
    {
         
        arry[i].num=a;
        scanf("%s",&str1);
        strcpy(arry[i].ch1,str1);
        if(strcmp(str1,"STOP") != 0)
        {
            scanf("%s",&str2);
            strcpy(arry[i].ch2,str2);
        }
        i++;
    }
 
    //inital
    length=i;
    p.top=0;
 
    //对每一条语句顺序执行
    for(i=0;i<=length;)
    {
        temp=0; //标记变量有没有定义
 
        //LET语句
        if(strcmp(arry[i].ch1,"LET") == 0)
        {
 
            ch=arry[i].ch2[0]; //取得变量
            for(k=0;k<p.top;k++)
            {
                if(p.st[k]==ch)
                {
                    temp=1; //变量已定义
                    if(isdigit(arry[i].ch2[2]) || arry[i].ch2[2]==‘-‘)//如果第单个是数字，则说明是常量。
                    {
                        for(t=0;t<strlen(arry[i].ch2)-2;t++)
                            temp1[t]=arry[i].ch2[t+2];
                        temp1[t]=‘\0‘;             
 
                        mapdata[arry[i].ch2[0]]=atoi(temp1);
                    }
                    else
                    {
                        if(arry[i].ch2[3] == ‘+‘)
                        {
                            mapdata[arry[i].ch2[0]]=mapdata[arry[i].ch2[2]]+mapdata[arry[i].ch2[4]];
                        }
                        if(arry[i].ch2[3] == ‘>‘)
                        {
                            if(mapdata[arry[i].ch2[2]] > mapdata[arry[i].ch2[4]])
                                mapdata[arry[i].ch2[0]]=1;
                            else
                                mapdata[arry[i].ch2[0]]=0;
                        }
                        break;
                    }
                }
         
            }
             
            if(temp == 0) //变量未定义
            {
                if(isdigit(arry[i].ch2[2]) || arry[i].ch2[2]==‘-‘)//如果第单个是数字，则说明是常量。
                {
                    p.st[p.top++]=arry[i].ch2[0];
 
                    for(t=0;t<strlen(arry[i].ch2)-2;t++)
                        temp1[t]=arry[i].ch2[t+2];
                    temp1[t]=‘\0‘;
 
                    mapdata[arry[i].ch2[0]]=atoi(temp1);
 
                     
                     
                }
                else
                {
                    p.st[p.top++]=arry[i].ch2[0];
                    if(arry[i].ch2[3] == ‘+‘)
                    {
                        mapdata[arry[i].ch2[0]]=mapdata[arry[i].ch2[2]]+mapdata[arry[i].ch2[4]];
                    }
                    else if(arry[i].ch2[3] == ‘>‘)
                    {
                        if(mapdata[arry[i].ch2[2]] > mapdata[arry[i].ch2[4]])
                            mapdata[arry[i].ch2[0]]=1;
                        else
                            mapdata[arry[i].ch2[0]]=0;
                    }
                     
                }
            }
            i++;
        }
 
 
        //PRINT语句
        if(strcmp(arry[i].ch1,"PRINT") == 0)
        {
            printf("%c=%d\n",arry[i].ch2[0],mapdata[arry[i].ch2[0]]);
            i++;
        }
 
 
        //IF语句
        if(strcmp(arry[i].ch1,"IF") == 0)
        {
            if(mapdata[arry[i].ch2[0]] <= mapdata[arry[i].ch2[2]])
                i++;
            i++;
        }
         
        //GOTO语句
        if(strcmp(arry[i].ch1,"GOTO") == 0)
        {
            int b;
            b=atol(arry[i].ch2);
            i=b-1;
        }
         
        //STOP语句
        if(strcmp(arry[i].ch1,"STOP") == 0)
            break;
    }
     
 
    /*
    //测试是否输入成功
    for(i=0;i<=length;i++)
    {
        printf("%d %s %s\n",arry[i].num,arry[i].ch1,arry[i].ch2);
    }
    */
    return 0;
}

 


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