编译原理词法分析实验报告

else { ch=fgetc(fp); buff[1]='\\0'; fseek(fp,-1,1); output(4,buff);}}

else /*无法识别的字符*/ {buff[0]=ch; buff[1]='\\0'; ch=fgetc(fp); fseek(fp,-1,1);

{printf(\非法字符%s\\n\} void save() { FILE *out;

out=fopen(\ while (gets(buff)) {fprintf(out,\ }

fclose(out); }

void output(int n,char *m) /*输出格式*/ { printf(\ %-2d , %-8s>\\n\

void main() {FILE *fp; char filename[20];

printf(\数据类型定义规则:\\n\

printf(\保留字--1 标识符--2 常数--3 运算符--4 分隔符--5\\n\ printf(\ scanf(\

fp=fopen(filename,\以只读方式打开指定文件*/

if((fp=fopen(filename,\ /*文件不存在输出错误*/ {printf(\ else {

printf(\种别码 , 值 >\\n\ while(ch!=EOF) { scan(fp); }

printf(\

printf(\ save(); } fclose(fp);

getchar() };