PAT 1065. A+B and C (64bit)

 1 #include <stdio.h>

 2 

 3 int main() {

 4         long n, a, b, c;

 5         long i;

 6         int ga, gb, gc, r;

 7         scanf("%ld", &n);

 8         for (i=0; i<n; i++) {

 9                 scanf("%ld%ld%ld", &a, &b, &c);

10                 ga = a >= 0;

11                 gb = b >= 0;

12                 gc = c >= 0;

13                 if (ga && gb) {

14                         if (gc) {

15                                 r = a > c - b;

16                         } else {

17                                 r = 0;

18                         }

19                 } else if (!ga && !gb) {

20                         if (gc) {

21                                 r = 0;

22                         } else {

23                                 r = a > c - b;

24                         }

25                 } else {

26                         r = a + b > c;

27                 }

28                 printf("Case #%ld: %s\n", i+1, r ? "true" : "false");

29 

30         }

31         return 0;

32 }

纯C，bool都用不了，不习惯了。符号相反的数相加肯定不会溢出。水一发。