【C语言及程序设计】项目2-28-2：字符统计

#include "stdafx.h"
#include <string.h>
#include <ctype.h>


int main()
{
	char str[99];
	printf("Please input the string:");
	gets_s(str,99);


	int i(0), a_num(0);
	while (str[i])
	{
		if (str[i] == ‘A‘ )
		{
			a_num++;
		}
		i++;
	}
	printf("number of letter A is %d.\n", a_num);


	i = 0; int upper_num(0), lower_num(0);
	while (str[i])
	{
		if (iswlower(str[i]))
		{
			lower_num++;
		}
		if (iswupper(str[i]))
		{
			upper_num++;
		}
		i++;
	}
	printf("number of lowercase letter is %d, uppercase is %d.\n", lower_num, upper_num);


	i = 0; int vowel_num[5] = {0,0,0,0,0};
	while (str[i])
	{
		switch (str[i])
		{
		case ‘a‘:vowel_num[0]++; break;
		case ‘e‘:vowel_num[1]++; break;
		case ‘i‘:vowel_num[2]++; break;
		case ‘o‘:vowel_num[3]++; break;
		case ‘u‘:vowel_num[4]++; break;
		default:break;
		}
		i++;
	}
	printf("number of vowel letters:\n");
	printf("\ta\te\ti\to\tu\n");
	for (int i = 0; i < 5; i++)
	{
		printf("\t%d", vowel_num[i]);
	}
	printf("\n");

	
	i = 0; static int digit_num[10];
	for (int i = 0; str[i]; i++)
	{
		if (isdigit(str[i]))
		{
			digit_num[str[i]-‘0‘]++;
		}
	}
	printf("number of digits:\n");
	for (int i = 0; i < 10; i++)
	{
		printf("\tnumber%d", i);
	}
	printf("\n");
	for (int i = 0; i < 10; i++)
	{
		printf("\t%d", digit_num[i]);
	}
	printf("\n");


	i = 0; static int alpha_num[26];
	for (int i = 0; str[i]; i++)
	{
		if (isalpha(str[i]))
		{
			if (isupper(str[i]))
			{
				str[i] += ‘a‘ - ‘A‘;
			}
			alpha_num[str[i] - ‘a‘]++;
		}
	}
	printf("number of each letter:\n");
	for (int i = 0;i<27; i++)
	{
		if (alpha_num[i] !=0) 
		{
			printf("%c = %d\n", ‘a‘+i, alpha_num[i]);
		}
		
	}
	printf("others are none.");
	printf("\n");
	

    return 0;
}