回答編集履歴
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@@ -1,113 +1 @@
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```C
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#include <stdio.h> // getchar, printf, puts
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#include <stdlib.h> // exit
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#include <string.h> // strchr
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void error(const char *s) { printf("Error: %s\n", s); exit(1); }
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void error2(int d)
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{
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error(d == '"' ? "string literal not closed" :"character constant not closed");
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}
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int parse(int e)
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{
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static char pa[] = "([{", ren[] = ")]}";
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int c;
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char *p;
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while ((c = getchar()) != EOF) {
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if (c == '/') {
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if ((c = getchar()) == EOF) return c;
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if (c == '/') // skip "// comment"
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while ((c = getchar()) != EOF && c != '\n') ;
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else if (c == '*') // skip "/* */ comment"
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do {
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while ((c = getchar()) != EOF && c != '*') ;
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1
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すでに回答しているのに、間違って新規の回答をしてしまいましたので、削除します。
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error("comment not closed");
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} while (c != '/');
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}
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else if (c == '"' || c == '\'') {
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int d = c, k = 0; // skip string literal or charcter constant
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do {
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if ((c = getchar()) == EOF || c == '\n') error2(d);
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if (c == '\') {
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if ((c = getchar()) == EOF) error2(d);
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if (c == d) c = 0;
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}
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k++;
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} while (c != d);
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if (d == '\'' && (k < 2 || k > 5)) error("bad character constant");
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}
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else if ((p = strchr(pa, c))) { // parse parentheses
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int r = ren[p - pa];
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if (parse(b) != r) error("paren not closed");
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}
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else if (strchr(ren, c)) break;
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}
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return c;
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}
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int main(void)
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{
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puts(parse(EOF) == EOF ? "OK" : "unexpected closing paren");
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}
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```
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113
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バグのご指摘お待ちしています。
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