编译原理实验 源程序的输入和扫描(2)

int readbuffer() //子程序开始 {

int j=0;

char ch;

//声明变量

while(j<256)

{

ch=fgetc(fp);

if (ch=='\n')

{

i=j;

return 0;

} //if

buffer[j]=ch;

++j;

}

return 1;

} //子程序结束

main() //main()开始

{

if((fp=fopen("d:\\a.c","r"))==NULL) {

printf("THE FILE DOESN’T OPEN！"); exit(0);

}

while(!feof(fp))

{

int j;

j=0;

readbuffer();

while(j<i)

{

printf("%c",buffer[j]);

j++;

}

printf("\n");

getch();

}

fclose(fp);

getch();

} //main()结束

//程序结束

2）当源文件为：