1 #include<stdio.h> 2 #include<stdlib.h> 3 #include <string.h> 4 char *rword[]={"dir","cd","md","rd","cls","date","time","ren","copy","exit","end"}; 5 char ci; 6 typedef struct{ 7 int num; 8 char *word; 9 }WORD; //存储种别码，单词 10 11 typedef struct{ 12 int number; 13 char means[5000]; 14 }Base; //存储种别码，单词 15 16 int ainput,toke; char input[300];char token[300]=" "; 17 Base mean[10]; 18 19 char mgetch(){ //读取一个字符 20 ci=input[ainput]; 21 ainput=ainput+1; 22 return (ci); 23 } 24 25 void getbc(){ //去空格 26 while(ci==' '||ci==10) 27 { ci=input[ainput]; 28 ainput+=1; 29 30 } 31 } 32 int letter() //判断是否为字母 33 { if(ci>='a'&&ci<='z'||ci>='A'&&ci<='Z') 34 return 1; 35 else 36 return 0; 37 } 38 int number() //判断是否为数字 39 { 40 if(ci>='0'&&ci<='9') 41 return 1; 42 else 43 return 0; 44 } 45 int reserve() // 判断是否为关键字 46 { 47 int i=0; 48 while(strcmp(rword[i],"end")) 49 { 50 if(!strcmp(rword[i],token)) 51 { 52 return i+1; 53 } 54 i++; 55 } 56 57 return 1001; 58 59 } 60 61 void link() //链接单词 62 { 63 token[toke]=ci; 64 toke+=1; 65 token[toke]=' '; 66 67 } 68 void back(){ 69 70 ainput-=1; 71 } 72 73 74 WORD * scaner(){ //判断字符串 75 WORD *myword; 76 myword=(WORD*)malloc(sizeof(WORD)); 77 myword->num=10; 78 myword->word=""; 79 toke=0; 80 mgetch(); 81 getbc(); 82 if(letter()){ 83 while(letter()||number()) 84 { 85 link(); 86 mgetch(); 87 } 88 back(); 89 myword->num =reserve(); 90 myword->word=token; 91 return(myword); 92 } 93 else switch(ci){ 94 case' ': myword->num=1000; 95 myword->word="over"; 96 return(myword); 97 break; 98 99 default: 100 myword->num=-1; 101 myword->word="error"; 102 return(myword); 103 104 } 105 106 } 107 108 109 void saveBase(){ //存储信息 110 int i=0; 111 112 for(i=0;i<10;i++) 113 { 114 mean[i].number =i+1; 115 } 116 strcpy(mean[0].means , "主要用来显示一个目录下的文件和子目录。"); 117 strcpy(mean[1].means , "改变或显示当前目录"); 118 strcpy(mean[2].means , "创建一个子目录 "); 119 strcpy(mean[3].means , " 删除空子目录 "); 120 strcpy(mean[4].means , "清除显示器屏幕上的内容，使DOS提示符到屏幕左上角 "); 121 strcpy(mean[5].means , "显示和设置DOS的系统日期 "); 122 strcpy(mean[6].means , "显示和设置DOS的系统时间 "); 123 strcpy(mean[7].means , "对指定磁盘、目录中的一个文件或一组文件更改名称 "); 124 strcpy(mean[8].means , "在英文中是复制的意思"); 125 strcpy(mean[9].means , "退出"); 126 127 } 128 129 130 /*void read() 131 { 132 FILE * fp; int i; 133 char data[500]; //char str; 134 if((fp=fopen("G:\datafile.txt","r"))==NULL) 135 { 136 printf("file cannot be opened "); 137 138 } 139 i=0; 140 while(!feof(fp)) 141 { 142 data[i++]=fgetc(fp); 143 i++; 144 data[i]=' '; 145 i--; 146 if(i>=500) 147 { 148 printf("buffer not enough!"); 149 150 } 151 152 } 153 154 printf("%s",data); 155 printf(" "); 156 157 fclose(fp); 158 } 159 */ 160 int main() //主函数 161 { 162 int over=1; WORD * oneword; int i; char check[10]=""; int j; 163 saveBase(); 164 printf("Microsoft Windows [版本 6.3.9600] "); 165 printf("<c> 2013 Microsoft Corporation。保留所有权利 "); 166 qq:printf(" C:userlenvon>"); 167 i=0;ainput=0;oneword=(WORD*)malloc(sizeof(WORD)); 168 do{ 169 ci=getchar(); 170 input[i]=ci; 171 i++; 172 }while(ci!=' '); 173 while(over!=10) 174 { 175 oneword=scaner(); 176 if(oneword->num<1000) 177 { 178 //printf("(%d,%s) ",oneword->num,oneword->word); 179 for(j=0;j<10;j++) 180 { 181 if(oneword->num==mean[j].number ) 182 { 183 printf(" %s",mean[j].means ); 184 break; 185 } 186 } 187 } 188 else if(oneword->num=1001) 189 printf("不存在所输入的功能"); 190 over=oneword->num; 191 if(over!=10) 192 { 193 goto qq; 194 } 195 } 196 }
