题目1116：加减乘除

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import java.io.IOException;import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.FileReader;import java.util.Scanner;class Main{public static final boolean DEBUG = false;public static long fac(int n) {if (n == 0) return 1;return n * fac(n - 1);}public static void main(String[] args) throws IOException{Scanner cin;String op;int a = 0, b = 0;if (DEBUG) {cin = new Scanner(new FileReader("d:\\OJ\\uva_in.txt"));} else {cin = new Scanner(new InputStreamReader(System.in));}while (cin.hasNext()) {a = cin.nextInt();op = cin.next();if (op.compareTo("!") != 0) b = cin.nextInt();if (op.compareTo("+") == 0) {System.out.println(a + b);} else if (op.compareTo("-") == 0) {System.out.println(a - b);} else if (op.compareTo("*") == 0) {System.out.println(a * b);} else if (op.compareTo("/") == 0) {if (b == 0) {System.out.println("error");} else {System.out.println(a / b);}} else if (op.compareTo("!") == 0) {System.out.println(fac(a));} else if (op.compareTo("%") == 0) {if (b == 0) System.out.println("error");else System.out.println(a % b);}}}}

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