[C++知识库]基于vs2019来用C语言 实现 1.输入3个数，求最大值 2.两个变量交换值的方法

#include<stdio.h>
#include<stdlib.h>
#include<string>
#include<iostream>
using namespace std;

//1.输入三个数，求最大值


//c语言的几种方法
int main()
{
	int a, b, c;
	scanf_s("%d%d%d", &a, &b, &c);
	int max;
	max = a;
	if (b > max)  max = b;
	if (c > max)  max = c;
	printf("最大值为：%d\n", max);
	system("pause");
	return 0;

}


int main()
{
	int a, b, c;
	scanf_s("%d%d%d", &a, &b, &c);

	a = a > b ? a : b;
	a = a > c ? a : c;
	printf("最大值为：%d\n", a);
    system("pause");
	return 0;

}



int main()
{
	int a, b, c;	scanf_s("%d%d%d", &a, &b, &c);
	if (a > b)

	{
		if (a > c)
		{
			printf("最大值为：%d\n", a);
		}
		else
		{
			printf("最大值为：%d\n", c);
		}
	}
	else
	{
	if (b > c)
		{
			printf("最大值为：%d\n", b);
		}
		else
		{
			printf("最大值为：%d\n", c);
		}
	}
	system("pause");
	return 0;

}
















//2.两个变量交换值的方法

//C语言

int main()
{
	int a,b;
	scanf_s("%d%d", &a, &b);
	int temp;
	temp = a;
	a = b;
	b = temp;
	printf("a=%d,b=%d\n", a, b);
	system("pause");
	return 0;
}


int main()
{
	int a, b;
	scanf_s("%d%d", &a, &b);
	a = a + b;
	b = a - b;
	a = a - b;
	printf("a=%d,b=%d\n", a, b);
	system("pause");
	return 0;
}


int main()
{
	int a, b;
    scanf_s("%d%d", &a, &b);
	a = a ^ b;
	b = a ^ b;
	a = a ^ b;
	printf("a=%d,b=%d\n", a, b);
	system("pause");
	return 0;
}



//C++中只需要将上面程序的的输入输出改为输入(cin>>)和输出(cout<<)就可以了