Question

从键盘输入双精度给变量X和Y，输出X和Y，再交换X和Y的值后输出X和Y

用C语言做！详细的再加五十分
你们写的有些我还没学到哦！能不能用比较直接，浅显的方法？

Answer 1

#include <stdio.h>
#include <stdlib.h>

int main()
{
double x, y;
double temp; //这个变量用来临时存放需要交换的值
printf("please input x: ");
scanf("%lf", &x);
printf("please input x: ");
scanf("%lf", &y);

printf("yue are x and y: %f, %f\n", x, y);
//开始交换数据的三行代码
temp = x;
x = y;
y = temp;
//**************
printf("swaped x and y: %f, %f\n", x, y);

getchar();
//getchar();
return(0);
}

Answer 2

#include <stdio.h>

int main()
{
double x, y;
double temp;
printf("input two Numbers: ");
scanf("%lf %lf", &x, &y);
printf("%lf, %lf\n", x, y);
temp = x;
x = y;
y = temp;
printf("%lf, %lf\n", x, y);

Answer 3

饿.....
void main()
{
float x,y,z;
scanf("%f%f",&x,&y);
printf("\n交换前x=%f,y=%f\n",x,y);

//交换
z=x;
x=y;
y=z;//这样就交换了
printf("\n交换后x=%f,y=%f\n",x,y);

}

Answer 4

#include<srdio.h>
viod main()
{
double x,y,a;
scanf("%lf %lf",&x,&y);
a=x;
x=y;
y=a;
printf("%lf, %lf\n", x, y);
}

Answer 5

#include <stdio.h>

void swap(double &x, double &y)
{
double temp = 0.0;

temp = y;
y = x;
x = temp;
}
void main()
{
double x = 0.0,y = 0.0;

scanf("%lf %lf",&x,&y);

printf("%lf\t%lf\n",x,y);

swap(x,y);
printf("%lf\t%lf\n",x,y);
}