任意输入一个整数，然后输出其加法表，如输入5

for循环

public class Test {

public static void main(String[] args) {
	Scanner input = new Scanner(System.in);

	System.out.print("请输入一个整数：");
	int num = input.nextInt();
	for (int i = 0; i <= num; i++) {
		System.out.println(i + "+" + (num-i) + "=" + num);
	}
}

}