• 输入一行字符串（单词和若干空格）， 输出该行单词个数。
  Input：____hello_________world_ how___are___you___\n
  Output: 5
• 输入一行字符串（单词和若干空格），输出该行单词（每个单词一行）
  Input：____hello_________world_ how___are___you___\n
  Output: hello
  world
  how
  are
  you
• 输入一行字符串，把字符串翻转 
  Input: I am a student
  Output: student a am I

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
#include<math.h>int wordStat(char a[]){int cnt=0, i=1;if(a[0] != ' ')cnt++;while(a[i] != '\0'){if(a[i] != ' ' && a[i-1] == ' '){cnt++;}i++;}return cnt;
}void wordPut(char a[]){int i=1;if(a[0] != ' ')printf("%c", a[0]);while(a[i] != '\0'){if(a[i] != ' '){printf("%c", a[i]);}else if(a[i]==' ' && a[i-1]!=' ')printf("\n");i++;}if(a[i-1] != ' ')printf("\n");
}void strTurn(){char a[50]={0},b[50] = {0}, word[20]={0};int i, j, cnt, num;while(gets(a) != NULL){i = 0; j = 0; cnt = 0; num = 0;while(a[i] != '\0'){i++;}i--;while(i>=0){if(a[i] == ' '){printf(" ");b[num] = ' ';num++;}//word 处理else{word[j] = a[i];if(a[i-1]==' ' && i>0 || i==0){cnt = j;while(cnt>=0){printf("%c", word[cnt]);b[num] = word[cnt];num++;cnt--;}j = 0;}else{j++;}}i--;}printf("\n");b[num] = '\0';printf("%s", b);}
}