FSM - comment remover

#include <stdio.h>
double x=1/3;
/* this is multiline comment,
 * continuing here...
 * and here...
 */

// this is a single line comment

int main()
{
    printf("Comment remover: insert C code, end=CTRL+Z\n");
    enum { START, SLASH, MULTILINE,
           END_OF_MULTILINE, SINGLELINE} state=START;
    int c;
    while ((c=getchar())!=EOF) {
        switch (state) {
        case START:
            if (c=='/') {
                state=SLASH;
            } else {
                putchar(c);
            }
            break;
        case SLASH:
            if (c=='*') {
                state=MULTILINE;
            } else if (c=='/') {
                state=SINGLELINE;
            } else {
                putchar('/');
                putchar(c);
                state=START;
            }
            break;
        case MULTILINE:
            if (c=='*') {
                state=END_OF_MULTILINE;
            }
            break;
        case END_OF_MULTILINE:
            if (c=='/') {
                state=START;
            } else {
                state=MULTILINE;
            }
            break;
        case SINGLELINE:
            if (c=='\n') {
                putchar(c);
                state=START;
            }
            break;
        }
    }
    return 0;
}