安之若素{
console.write("hello world c#!\r\nplease enter your name:");
string name = console.readline();
console.write("hello {0}, please enter the year you were born:", name);
int year = int.maxvalue;
while(year == int.maxvalue)
{
try
{
year = int.parse(console.readline());
}
catch (formatexception)
{
console.write("you did not enter a valid number. ");
console.writeline("please enter an integer, such as 1975. ");
}
}
console.writeline("you must be approximately {0} years old! ",
datetime.now.year-year);
console.writeline("press the key to exit the application");
console.read();
}
