#include<stdio.h>void main(){  int c, letter=0, num=0, blank=0, tab=0, enter=0, other=0 ,i=0, sum=0;  printf("Please input a string:/n");  while((c=getchar())!=EOF){    sum++;    if(c==' '){      ++blank; //空格鍵的個數    }    else if(c=='/t'){      ++tab;  //Tab鍵的個數    }    else if(c=='/n'){      ++enter;  //回車鍵的個數    }    else if((c>='A' && c<='Z') || (c>='a' && c<='z')){      ++letter;  //字母的個數    }    else if(c>='0' && c<='9'){      ++num;   //數字的個數    }    else ++other;   //其他字符的個數    i++;  }  printf("There are %d characters/n", sum);  printf("blank=%d, Tab=%d, Enter=%d, letter=%d, number=%d ,other=%d/n",blank, tab, enter, letter, num, other);}