Question

编写一个删除C语言程序中所有注释语句

#include<stdio.h>

void rcomment(int c);
void in_comment(void);
void echo_quote(int c);

void main()
{
int c, d;

while ((c = getchar()) != EOF)
rcomment(c);
return 0;
}

void rcomment(int c)
{
int d;

if (c == '/')
if ((d = getchar()) == '*')
in_comment();
else if (d == '/')
{
putchar(c);
rcomment(d);
}
else
{
putchar(c);
putchar(d);
}
else if (c == '\'' || c == '"')
echo_quote(c);
else
putchar(c);
}

void in_comment(void)
{
int c, d;

c = getchar();
d = getchar();
while (c != '*' || d != '/')
{
c = d;
d = getchar();
}
}
void echo_quote(int c)
{
int d;

putchar(c);
while ((d = getchar()) != c)
{
putchar(d);
if (d == '\\')
putchar(getchar());
}
putchar(d);
}
求讲解

Answer 1

#include <stdio.h>
int main()
{
	FILE *fp,*fp1;
	char str[99]="";
	int i=0;
	fp=fopen("test.c","r"); //要打开的源文件
	fp1=fopen("new.c","w"); //另存为
	while(fgets(str,99,fp)!=NULL)
	{
		for(i=0;i<99;i++)
		if(str[i]=='/'&&str[i-1]=='/'){str[i-1]='\n';str[i]='\0';break;}
		fputs(str,fp1);
	}
	fcloseall();
	return 0;
}

 

如果有/* */块注释的话，用这个
#include <stdio.h>
#include <string.h>
int main()
{
    FILE *fp,*fp1;
    char str[99]="",str1[99]="";
    int i,j,no=0;
    fp=fopen("test.c","r"); //要打开的源文件
    fp1=fopen("new.c","w"); //另存为
    while(fgets(str,99,fp)!=NULL)
    {
        for(i=0;i<99;i++)
		{
			if(str[i]=='/'&&str[i-1]=='/')
			{str[i-1]='\n';str[i]='\0';}

			if(str[i]=='*'&&str[i-1]=='/')
			{str[i-1]='\0';no=1;fputs(str,fp1);}
		
			if(str[i]=='/'&&str[i-1]=='*')
			{
				for(j=0;j<98-i;j++){str[j]=str[i+j+1];}
				str[j]='\0';
				no=0;
			}
		}
        if(no==0)fputs(str,fp1);
    }
    fcloseall();
    return 0;
}