1 /*boolean.c--使用_Bool類型的變量variable*/

 2 #include<stdio.h>

 3 int main(void)

 4 {

 5 long num;

 6 long sum=0L;

 7 _Bool input_is_good;

 8

 9 printf("Please enter an integer to be summed ");

10 printf("(q to quit):");

11 input_is_good=(scanf("%ld",&num)==1);

12 while(input_is_good)

13 {

14 sum=sum+num;

15 printf("Please enter next integer (q to quit):");

16 input_is_good=(scanf("%ld",&num)==1);

17 }

18 printf("Those integers sum to %ld.\n",sum);

19

20 return 0;

21 }/*程序中把比較的結果賦值給_Bool類型的變量input_is_good

22 /*

23 Sample Output

24

25 Please enter an integer to be summed (q to quit):1

26 Please enter next integer (q to quit):2

27 Please enter next integer (q to quit):3

28 Please enter next integer (q to quit):4

29 Please enter next integer (q to quit):5

30 Please enter next integer (q to quit):6

31 Please enter next integer (q to quit):8

32 Please enter next integer (q to quit):0

33 Please enter next integer (q to quit):w

34 Those integers sum to 29.

35

36 */