//编写一个删除c语言中所有的注释语句
/******************************************************
"Write a program to remove all comments from a C program.
Don't forget to handle quoted strings and character
constants properly. C comments do not nest."
**/
#include <stdio.h>
#define MAXLINE 1000 /* max input line size */
char line[MAXLINE]; /*current input line*/
int getline(void); /* taken from the KnR book. */
int main()
{
int in_comment,len;
int in_quote;
int t;
in_comment = in_quote = t = 0;
while ((len = getline()) > 0 )
{
t=0;
while(t < len)
{
if( line[t] == '"')
in_quote = 1;
if( ! in_quote )
{
if( line[t] == '/' && line[t+1] == '*') //注释开始
{
t=t+2;
in_comment = 1;
}
if( line[t] == '*' && line[t+1] == '/') //注释结束
{
t=t+2;
in_comment = 0;
}
if(in_comment == 1) //注释中的内容,不打印
{
t++;
}
else
{
printf ("%c", line[t]);//非注释,打印
t++;
}
}
else
{
printf ("%c", line[t]);
t++;
}
}
}
return 0;
}
/* getline: specialized version */
int getline(void)
{
int c, i;
extern char line[]; //全局变量
for ( i=0;i<MAXLINE-1 && ( c=getchar()) != EOF && c != '\n'; ++i)
line[i] = c;
if(c == '\n')
{
line[i] = c;
++i;
}
line[i] = '\0';
return i;
}
//该程序只能按行输入,若输入多行,只能消去最后一行的注释,且c++中的注释‘//’不能消除