/* Write a program to print a histogram of the frequencies of different
characters in its input. */
#include <stdio.h>
#include <ctype.h>
#define MAXHIST 15 /* max length of histogram */
#define MAXCHAR 128 /* max different characters */
/* print horizontal histogram frequencies of different characters */
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');
}
}
版权声明：本文为博主原创文章，未经博主允许不得转载。
C - The C Answer (2nd Edition) - Exercise 1-14
原文地址：http://blog.csdn.net/troubleshooter/article/details/47056223
