0924，函数返回多个值

class Program

{

//函数多个返回值

//输入参数前加Out就变成输出参数

public int jisuan(int a, int b, out int c)

{

c = a - b;

return a + b;

}

public int jiefangcheng(int a, int b, int c, out double x1, out double x2)

{

x1 = 0;

x2 = 0;

if (0 == b * b - 4 * a * c)

{

x1 = (-b) / (2 * a);

x2 = x1;

return 1;

}

else if (0 < b * b - 4 * a * c)

{

x1 = (-b + Math.Sqrt(b * b - 4.0 * a * c)) / (2.0 * a);

x2 = (-b - Math.Sqrt(b * b - 4.0 * a * c)) / (2.0 * a);

return 2;

}

else

{

return 0;

}

}