pat 1065 A+B and C (64bit)（20 分）(大数， Java)

1065 A+B and C (64bit)（20 分）

Given three integers A, B and C in [−2​63​​,2​63​​], you are supposed to tell whether A+B>C.

Input Specification:

The first line of the input gives the positive number of test cases, T (≤10). Then T test cases follow, each consists of a single line containing three integers A, B and C, separated by single spaces.

Output Specification:

For each test case, output in one line Case #X: true if A+B>C, or Case #X: false otherwise, where X is the case number (starting from 1).

Sample Input:

3
1 2 3
2 3 4
9223372036854775807 -9223372036854775808 0

Sample Output:

Case #1: false
Case #2: true
Case #3: false

import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.DecimalFormat;
import java.util.Scanner;

import javax.xml.namespace.QName;

public class Main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        BigInteger a, b, c;
        int t = scan.nextInt();
        for (int i = 1; i <= t; ++i) {
            a = scan.nextBigInteger();
            b = scan.nextBigInteger();
            c = scan.nextBigInteger();
            String s = a.add(b).subtract(c).toString();
            if (s.charAt(0) != '-' && s.charAt(0) != '0')
                System.out.println("Case #" + i + ": true");
            else
                System.out.println("Case #" + i + ": false");
        }
    }
}