public static void Main()
string c, d, e, f, g, h, i, j;
double k, l, m, n, o, p, q, r;
c = Convert.ToString(a[0]);
d = Convert.ToString(a[1]);
e = Convert.ToString(a[2]);
f = Convert.ToString(a[3]);
g = Convert.ToString(b[0]);
h = Convert.ToString(b[1]);
i = Convert.ToString(b[2]);
j = Convert.ToString(b[3]);
k = Convert.ToDouble(c) / 7;
l = Convert.ToDouble(d) / 7;
m = Convert.ToDouble(e) / 7;
n = Convert.ToDouble(f) / 7;
o = Convert.ToDouble(g) / 7;
p = Convert.ToDouble(h) / 7;
q = Convert.ToDouble(i) / 7;
r = Convert.ToDouble(j) / 7;
Console.WriteLine("Perantara");
Console.WriteLine("Char to String");
Console.WriteLine("String to Double");