C程序设计语言习题（1-13、14）

练习1-13  编写一个程序，打印输入中单词长度的水平直方图

#include<stdio.h>

#define IN         1   /*在单词内*/
#define OUT        0   /*在单词外*/
#define MAXHIST    15  
#define MAXWORD    11

int main()
{
	int c, i, nc, state;
	int len;
	int maxvalue;
	int ovflow;
	int wl[MAXWORD];

	state = OUT;
	nc = 0;
	ovflow = 0;
	for(i = 0; i < MAXWORD; ++i) 
		wl[i] = 0;
	while ((c = getchar()) != EOF) {
		if(c == ' ' || c == '\n' || c == '\t') {
			state = OUT;
			if(nc > 0)
				if(nc < MAXWORD)
					++wl[nc];
			    else
					++ovflow;
			nc = 0;
		} else if (state == OUT) {
			state = IN;
			nc = 1;
		} else
			++nc;
	}
	maxvalue = 0;
	for(i = 1; i < MAXWORD; ++i)
		if(wl[i] > maxvalue)
			maxvalue = wl[i];
	for(i = 1; i < MAXWORD; ++i) {
		printf("%5d - %5d : ", i, wl[i]);
		if(wl[i] > 0) {
			if((len = wl[i] * MAXHIST / maxvalue) <= 0)
				len = 1;
		} else
				len = 0;
		while (len > 0) {
				putchar('*');
				--len;
		}
			putchar('\n');
	}
	if(ovflow > 0)
		printf("There are %d words >= %d\n", ovflow, MAXWORD);

	return 0;
}

练习1-14 编写一个程序，打印输入中各个字符出现频率的直方图

#include<stdio.h>

#define IN         1   /*在单词内*/
#define OUT        0   /*在单词外*/
#define MAXHIST    15  
#define MAXWORD    11
#define MAXCHAR    128

int main()
{
	int c, i;
	int len;
	int maxvalue;
	int cc[MAXCHAR];

	for(i = 0; i < MAXCHAR; ++i)  /*初始化字符个数统计数组*/
		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');
	}
}