1.23 in C

#include <stdio.h>
#define BUF_SIZE 1024

int main(void){
	char s[BUF_SIZE];
	int i, j, len;
	int comment1, comment2, quoted1, quoted2;
	comment1 = comment2 = quoted1 = quoted2 = 0;
	while (fgets(s,BUF_SIZE,stdin)){
		for (i = 0; i< strlen(s); i++){
			if (quoted1){
				if (s[i] == '\\') {
					putchar(s[i]);
					putchar(s[++i]);
				} else if (s[i] == '\"'){
					quoted1 = 0;
				}
				putchar(s[i]);
			} else if (quoted2){
				if (s[i] == '\\') {
					putchar(s[i]);
					putchar(s[++i]);
				} else if (s[i] == '\''){
					quoted2 = 0;
				}
				putchar(s[i]);
			} else if(comment1) {
				if (s[i] == '*' && s[i+1] == '/') {
					comment1 = 0;
					i++;
					putchar('\n');
				}
			} else if(comment2) {
				if (s[i] == '\n') {
					comment2 = 0;
					putchar('\n');
				}
			} else {
				if (s[i] == '\"'){
					quoted1 = 1;
					putchar(s[i]);
				} else if (s[i] == '\''){
					quoted2 = 1;
					putchar(s[i]);
				} else if (s[i] == '/') {
					if(s[i+1] == '*') {
						comment1 = 1;
						i++;
					} else if (s[i+1] == '/') {
						comment2 = 1;
						i++;
					} else {
						putchar(s[i]);
					}
				} else {
					putchar(s[i]);
				}
			}
		}

	}
	return 0;
}

1.23 in Python

def linefind(s,t):  #searching symbol "t" expected to be forward of a linefeed
    p = s.find(t)
    eol = s.find('\n')  #if '\n' isn't found, eol = -1
    if eol == -1 or p <= eol:
        return p
    else:
        return -1

def commentDeleter(p):
    quote3 = 0;
    s=''
    i=0
    while(i < len(p)):
        if p[i] == '"':
            t = linefind(p[i+1:],'"')
            if t == -1:         #can't find pairing '"'
                raise 'syntax error ---string must be closed with double quotation'
            else:
                s += p[i:i+t+2] #add "string..."
                i = i + t + 2   #2 means ""itself
        elif p[i] == "'":
            t = linefind(p[i+1:],"'")
            if t == -1:         #can't find pairing "'"
                raise 'syntax error ---string must be closed with quotation'
            else:
                s += p[i:i+t+2] #add 'string...'
                i = i + t + 2   #2 means ''itself
        elif i+2 < len(p) and p[i] == '"' and p[i+1] == '"' and p[i+2] == '"':
            t = p[i+3:].find('"""')
            if t == -1: 
                raise 'syntax error ---string must be closed with """'
            else:
                s += p[i:i+t+6] #add """string..."""
                i = i + t + 6   #6 means ""","""
        elif p[i] == '#':
            t = linefind(p[i+1:],'\n')
            s += '\n'
            i = i + t + 2       #2 means # and '\n'
        else:
            s += p[i]
            i += 1
    return s

Python版はPythonのコメントを削除する……ハズ。findは見つからなかったときNoneではなくて -1 を返すのか。正規表現とか使えばもっとスマートになるんだろうか。