统计字母、数字、空格个数

#include <iostream>
 
 using std::cout;
 using std::endl;
 
 int main() {
     int letter = 0;
     int space = 0;
     int number = 0;
     char content;
     cout << "请输入一行字符：" << endl;
     while((content = getchar()) && (content != '\n')) {
         if((content >= 'a' && content <= 'z') || (content >= 'A' && content <= 'Z')) {               letter++;
         }       
         else if(content >= '0' && content <= '9') {
             number++;
         }       
         else if(content == ' ') {
             space++;
         }       
     }       
 
     cout << "英文字母个数为：" << letter << endl;
     cout << "空格个数为：" << space << endl; 
     cout << "数字个数为：" << number << endl;
         
     return 0;                                                                           
 }

统计单词个数