练习114 编写一个程序， 打印输入中各个字符出现频度的直方图。

由于智商是硬伤..依然是照抄答案。

#include <stdio.h>
#include <ctype.h>
#define MAXHIST 15
#define MAXCHAR 128

int main()
{
int c, i;
int len; //length of each bar//
int maxvalue; //maximum value for cc[]//
int cc[MAXCHAR]; //character counters //

for(i = 0; i < MAXCHAR; ++i)
cc[i] = 0;
while ((c = getchar()) != EOF)
if (c < MAXCHAR)
++cc[c];
maxvalue = 0;
for(i = 1; i < MAXCHAR; ++i)
if(cc[i] > maxvalue)
maxvalue = cc[i];

for (i = 1; i <MAXCHAR; ++i){
if(isprint(i))
printf("%5d - %c - %5d :", i, i, cc[i]);
else
printf("%5d - - %5d :", 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');
}

}