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
", 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。