#include <stdio.h>
#include <math.h>

double magic1 (double num1,double num2)
{
    double num3;
    num3 = (sqrt ((num1 + num2)/2) + sqrt ((num1 - num2)/2))/2;
    return num3;
}
double magic2 (double num1,double num2)
{
    double num3;
    num3 = (sqrt ((num1 + num2)/2) - sqrt ((num1 - num2)/2))/2;
    return num3;
}

int main ()
{
    double a,b;
    scanf ("%d    %d" ,a,b);
    double x = magic1 (a,b);
    double y = magic2 (a,b);
    printf ("%lf        %lf",x,y);
    return 0;
}

[此贴子已经被作者于2018-2-20 12:12编辑过]

错误好多啊

#include <stdio.h>
#include <math.h>

double magic1 (double num1,double num2)
{
    double num3;
    num3 = (sqrt ((num1 + num2)/2) + sqrt ((num1 - num2)/2))/2; 
                                    //double,float型数据参与运算的时候最好把常数改成小数点的形式,有的时候部分编译器会报警,此处最好改成2.0
                                    //另外,注意后面的sqrt()函数,该函数不会计算负数的平方根,所以,输入的时候一定要注意num1>num2. 下同                                 
    return num3;
}
double magic2 (double num1,double num2)
{
    double num3;
    num3 = (sqrt ((num1 + num2)/2) - sqrt ((num1 - num2)/2))/2;
    return num3;
}

int main ()
{
    double a,b;
    scanf ("%d    %d" ,a,b); 
           //double型数据输入的时候用%lf, 两个参数间最好不添加其他字符(非强制,可以写,输入的时候知道怎么处理就可以写),直接写成%lf%lf即可.
           //scanf()处理的时候变量的地址,不可直接用变量,所以要改成&a,&b
    double x = magic1 (a,b);
    double y = magic2 (a,b);
    printf ("%lf        %lf",x,y);
    return 0;
}

//编译完成测试后的时候,切记输入的数字要a>b,不然结果依旧不正确

#include <stdio.h>
#include <math.h>

double magic1 (double num1,double num2)
{
    double num3;
    num3 = (sqrt ((num1 + num2)/2) + sqrt ((num1 - num2)/2))/2;<===  num3 = (sqrt ((num1 + num2)/2.0) + sqrt ((num1 - num2)/2.0))/2.0;
    return num3;
}
double magic2 (double num1,double num2)
{
    double num3;
    num3 = (sqrt ((num1 + num2)/2) - sqrt ((num1 - num2)/2))/2;  《====  num3 = (sqrt ((num1 + num2)/2.0) - sqrt ((num1 - num2)/2.0))/2.0;
    return num3;
}

int main ()
{
    double a,b;
    scanf ("%d    %d" ,a,b);《===scanf ("%lf    %lf" ,&a,&b);   // 输入为double类型，控制格式为"lf",不是"%d"。这里不能省略取地址运算符"&"
    double x = magic1 (a,b);
    double y = magic2 (a,b);
    printf ("%lf        %lf",x,y);
    return 0;
}