实现去除c语言注释的小工具
去除C代码中的注释，
1. 单行注释//；
2. 多行注释/**/；
3. 单行注释以“\”结尾则下一行也为注释；
4. 字符串中的注释不处理。
说是C语言，但其实所有C语系的都可以，比如Java。
小工具：去除C语言注释
#include <stdio.h>
int main(int argc, char* argv[]) {
enum {
literal,
single,
multiple,
string
} mode = literal;
char last = 0, current;
while ((current = getchar()) != EOF) {
switch (mode) {
case single: {
if (last != '\\' && (current == '\n' || current == '\r')) {
putchar(current);
current = 0;
mode = literal;
}
} break;
case multiple: {
if (last == '*' && current == '/') {
current = 0;
mode = literal;
}
} break;
case string: {
if (last == '\\') {
putchar(last);
putchar(current);
} else if (current != '\\') {
putchar(current);
if (current == '"') {
mode = literal;
}
}
} break;
default: {
if (last == '/') {
if (current == '/') {
mode = single;
} else if (current == '*') {
mode = multiple;
} else {
putchar(last);
putchar(current);
}
} else if (current != '/') {
putchar(current);
if (current == '"') {
mode = string;
}
}
} break;
}
last = current;
}
return 0;
}
测试代码
#include <stdlib.h>
#include <stdio.h>
int main (int argc, char *argv[])
{
// not show\
not show\
not show
// not show
/* not show */
int is; // not show
int/* not show */ ms; /* not show */
double ds; // not show\
not show\
not show
double dm; /* ...
not show
not show */ float fs; /**
* now show
*/
float/**/ fm;
char cs[] = "aaa // /***/";
char cm1[] = /* not show */"hello*/";
char cm2[] = "/*redraiment"/* not show */;
/* printf("/////"); */
return EXIT_SUCCESS;
}
处理后的代码
#include <stdlib.h>
#include <stdio.h>
int main (int argc, char *argv[])
{
int is;
int ms;
double ds;
double dm; float fs;
float fm;
char cs[] = "aaa // /***/";
char cm1[] = "hello*/";
char cm2[] = "/*redraiment";
return EXIT_SUCCESS;
}
