#include <stdio.h>#define NOT_BLANK 1
#define BLANK 0main()
{
int c;
int last_ch = NOT_BLANK; while ((c=getchar()) != EOF){
if (c == ' ' || c == '\n' || c == '\t'){
if (last_ch == NOT_BLANK)
putchar('\n');
last_ch = BLANK;//这条语句可以包括在最近的if里面
}else{
putchar(c);
last_ch = NOT_BLANK;
}
}
}