练习1-12

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int main(void){    int ch;    int last = BLANK;while( ( ch = getchar() ) != EOF){if( ch == ' ' || ch == '\n' || ch == '\t'){if( last == WORD )            {    putchar( '\n' );    last = BLANK;            }}else{putchar( ch );last = WORD;}}    return 0;}

?每行一个单词的形式打印其输出