20 lines
515 B
C
20 lines
515 B
C
/* declare array */
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int frequency[26];
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int ch;
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FILE* txt_file = fopen ("a_text_file.txt", "rt");
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/* init the freq table: */
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for (ch = 0; ch < 26; ch++)
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frequency[ch] = 0;
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while (1) {
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ch = fgetc(txt_file);
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if (ch == EOF) break; /* end of file or read error. EOF is typically -1 */
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/* assuming ASCII; "letters" means "a to z" */
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if ('a' <= ch && ch <= 'z') /* lower case */
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frequency[ch-'a']++;
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else if ('A' <= ch && ch <= 'Z') /* upper case */
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frequency[ch-'A']++;
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}
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