回答編集履歴
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プログラムの例示を追加
test
CHANGED
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@@ -39,3 +39,177 @@
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ただし、状態遷移図を残して置かないと後から見てわけわからないプログラムになりがちかもしれません。
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# 追記
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以上の考え方に基づいてプログラムにするとこうなります。
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```c
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <iso646.h>
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enum state_t {
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word,
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punctuation,
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comment,
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comment_pending,
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comment_finish_pending
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};
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int main(int argc, char *argv[])
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{
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FILE *fp;
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switch(argc) {
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case 1:
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fp = stdin;
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break;
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case 2:
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fp = fopen(argv[1],"r");
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if(fp == NULL) {
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fprintf(stderr, "%s:ファイルが開けませんでした%s\n", argv[0], argv[1]);
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return EXIT_FAILURE;
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}
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break;
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default:
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fprintf(stderr, "引数の個数が間違っています");
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return EXIT_FAILURE;
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}
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int line_count = 0;
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int word_count = 0;
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int character_count = 0;
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enum state_t state = punctuation;
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int ch;
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while((ch = getc(fp)) != EOF) {
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character_count++;
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if(ch=='\n') line_count++;
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if(state==punctuation && not isalpha(ch) && ch!='/') {
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}
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else if(state==punctuation && isalpha(ch)) {
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state = word;
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word_count++;
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} else if(state==punctuation && ch=='/') {
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state = comment_pending;
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} else if(state==word && ch=='/') {
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state = comment_pending;
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} else if(state==word && not isalpha(ch) && ch!='/') {
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state = punctuation;
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} else if(state==word && isalpha(ch)) {
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} else if(state==comment_pending && isalpha(ch)) {
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state = word;
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word_count++;
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} else if(state==comment_pending && not isalpha(ch) && ch!='*') {
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state = punctuation;
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} else if(state==comment_pending && ch=='*') {
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state = comment;
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word_count++; // コメントを一語扱いする場合
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} else if(state==comment && ch!='*') {
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} else if(state==comment && ch=='*') {
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state = comment_finish_pending;
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} else if(state==comment_finish_pending && ch=='/') {
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state = punctuation;
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} else if(state==comment_finish_pending && ch!='/') {
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state = comment;
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}
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}
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printf("行数=%d 単語数=%d 文字数=%d\n", line_count, word_count, character_count);
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fclose(fp);
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return 0;
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}
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```
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アスキーコードの範囲内しか考えていないので、文字数はバイト単位で数えてしまうことに気を付けてください。
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