For loop ① fence length ② square brick Area ③ Judge Leap year common year

static void Main (string[] args)
{

Const double PI = 3.14;

const int bar_unit_price = 25;

const int brick_unit_price = 85;

Input

int A, B;

Console.Write ("Please enter the pool radius:");

string S1 = Console.ReadLine ();

A = Convert.ToInt32 (S1);

Console.Write ("Please enter the square radius:");

String s2 = Console.ReadLine ();

b = Convert.ToInt32 (s2);

Operation

Double L = 2 * PI * A; Find the perimeter of the pool

Double area1 = PI * A * a;//the area of the pool.

Double AREA2 = PI * b * b;//total area.

Double area = area2-area1;//Square size

Double barprice = l * bar_unit_price; Total cost of guardrail

Double Brickprice = area * brick_unit_price;//square cost.

Output

Console.WriteLine ("The length of the guardrail is" + L + "meters, the total area of the square brick is" + areas + "square meters, the total cost is" + (Barprice + brickprice) + "Yuan");

}

}
}

The second question determines the case of the root of a two-time equation.

static void Main (string[] args)

{int A, b, C;             Input Console.Write ("Please enter factor A:");

A = Convert.ToInt32 (Console.ReadLine ());

Console.Write ("Please enter factor B:");

b = Convert.ToInt32 (Console.ReadLine ());

Console.Write ("Please input factor C:");

c = Convert.ToInt32 (Console.ReadLine ());

Operation output

if (a = = 0)

{

Console.WriteLine ("Not a two-dimensional equation");

}

Else

{

int d = b * b-4 * a * C;

if (d > 0)

{

Console.WriteLine ("Two Unequal real roots");

}

else if (d = = 0)

{

Console.WriteLine ("Two Equal real Roots");

}

Else

{

Console.WriteLine ("No real Roots");

}

}

}

}

}

The third question, enter a year to determine whether it is leap years or common year.

static void CCC (string[] args)

{

int year;

Input

Console.Write ("Please enter a year:");

Year = Convert.ToInt32 (Console.ReadLine ());

Operation

Divisible by 400, or divisible by 4, but not divisible by 100.

If ((year% 400 = = 0) | | (year% 4 = = 0 && Year% 100! = 0))

{

Console.WriteLine ("is a leap year");

} else

{

Console.WriteLine ("is common year");

}

}

}

}

For loop ① fence length ② square brick Area ③ Judge Leap year common year