494 - Kindergarten Counting Game

 Kindergarten Counting Game 

Everybody sit down in a circle. Ok. Listen to me carefully.

``Woooooo, you scwewy wabbit!''

Now, could someone tell me how many words I just said?

 

Input and Output

Input to your program will consist of a series of lines, each line containing multiple words (at least one). A ``word'' is defined as a consecutive sequence of letters (upper and/or lower case).

 

Your program should output a word count for each line of input. Each word count should be printed on a separate line.

 

Sample Input

 

Meep Meep!
I tot I taw a putty tat.
I did! I did! I did taw a putty tat.
Shsssssssssh ... I am hunting wabbits. Heh Heh Heh Heh ...

 

Sample Output

 

2
7
10
9

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本题主要是判断一行字符串中有多少个word。判断方法为，一个字母开头到不是字母的字符结束为一个词。注意：也许一行的开头就是非字符

#include<stdio.h>
#include<string.h>
#include<ctype.h>
#define MAXN 1000
char buf[MAXN];
int main(){
    int len,j,sum;
    char oldch;
    while(fgets(buf,MAXN,stdin) != NULL){
        len = strlen(buf);
        sum = 0;
        oldch = buf[0];
        for(j = 1; j < len; j++){
           if(isalpha(oldch) > 0  && isalpha(buf[j]) == 0){
                sum++;
            }
           oldch = buf[j];
        }
        printf("%d\n",sum);
    }
}

刚开始犯的错误为：认为开端一定为字符，判断就使用了isalpha(j)  == 0 && isalpha(j-1) > 0，这导致开端为非字符的时候出现问题。