int → string
String str = 50.ToString();
string → int
int num = int.Parse("50");
bool → int
using System;
Convert.ToInt32(bool値);
int → bool
using System;
Convert.ToBoolean(int値);
int → float
int a = 1; float b = (float)a;
float → int
float a = 1; int b = (int)a;