字符出现频率的直方图

输出部分与单词个数直方图类似。

// 字符出现频率的直方图#include <stdio.h>#include <ctype.h>#define MAXHIST 15// max length of histogram#define MAXCHAR 128// max different characters// Print horizontal histogram freq. of different charactersint main(){int i, c;int len;// length of each barint maxvalue;// maximum value for cc[]int cc[MAXCHAR];// character countersfor (i = 0; i < MAXCHAR; i++){cc[i] = 0;}while ((c = getchar()) != EOF){if (c < MAXCHAR){++cc[c];// 对应字符的个数}}// find the maximum value in cc[MAXCHAR]maxvalue = 0;for (i = 1; i < MAXCHAR; i++)// wl[0]未使用（单词的长度>0）{if (cc[i] > maxvalue){maxvalue = cc[i];}}// 输出直方图（水平）for (i = 1; i < MAXCHAR; ++i){if (isprint(i)){printf("%5d - %c - %2d : ", i, i, cc[i]);}else{printf("%5d - - %2d : ", i, cc[i]);}if (cc[i] > 0){if ((len = cc[i] * MAXHIST / maxvalue) <= 0){len = 1;}}else{len = 0;}while (len > 0){putchar('*');--len;}putchar('/n');}return 0;}