输入一行字符，分别统计出其中英文字母、数字、空格和其它字符的个数。c++

#include <stdio.h>
#include <ctype.h>

int main()
{
char str[100];
int i, letter, digit, space, other;

letter = digit = space = other = 0;

printf("请输入一行字符：");
fgets(str, 100, stdin);

for(i = 0; str[i] != '\0'; i++)
{
if(isalpha(str[i]))
{
letter++;
}
else if(isdigit(str[i]))
{
digit++;
}
else if(str[i] == ' ')
{
space++;
}
else
{
other++;
}
}

printf("字母个数：%d\n", letter);
printf("数字个数：%d\n", digit);
printf("空格个数：%d\n", space);
printf("其它字符个数：%d\n", other);

return 0;
}