在求平均數的方法中，大家最喜歡用的就是先求兩個數的和，然後再除以2，得到的結果即為兩個數的平均數，實現的程式碼如下：

<pre name="code" class="cpp">#include<stdio.h>
#include<Windows.h>
#pragma warning(disable:4996)

int main()
{
	int a = 0;
	int b = 0;

	printf("Please inter a,b:");

	scanf("%d %d", &a, &b);

	printf("%d and %d average is %d\n", a, b, (a + b) / 2);

	system("pause");
	return 0;
}
 

若不使用(a+b)/2，若學過移位的童鞋會使用右移的方法，右移一位就相當於除以2,。

int main()
{
	int a = 0;
	int b = 0;

	printf("Please inter a,b:");

	scanf("%d %d", &a, &b);

	printf("%d and %d average is %d\n", a, b, (a + b) >> 1);

	system("pause");
	return 0;
}

int main()
{
	int a = 0;
	int b = 0;

	printf("Please inter a,b:");

	scanf("%d %d", &a, &b);

	printf("%d and %d average is %d\n", a, b, (a >> 1)+( b >> 1));

	system("pause");
	return 0;
}
 

int main()
{
	int a = 0;
	int b = 0;

	printf("Please inter a,b:");

	scanf("%d %d", &a, &b);

	if ((a % 2 == 1) && (b % 2 == 1))
	{
		printf("%d and %d average is %d\n", a, b,1 + (a >> 1) + (b >> 1));
	}
	else
	{
		printf("%d and %d average is %d\n", a, b, (a >> 1) + (b >> 1));
	}

	system("pause");
	return 0;
}
 

但是這種方法又過於繁瑣，經過深思熟慮之後，我又想到了一種方法：

int main()
{
	int a = 0;
	int b = 0;

	printf("Please inter a,b:");

	scanf("%d %d", &a, &b);

	printf("%d and %d average is %d\n", a, b, a + (b - a) / 2);

	system("pause");
	return 0;
}

int main()
{
	int a = 0;
	int b = 0;

	printf("Please inter a,b:");

	scanf("%d %d", &a, &b);

	printf("%d and %d average is %d\n", a, b, (a&b) + ((a^b) >> 1));

	system("pause");
	return 0;
}