How can I read user input from the console

Question

I want to get a number from the user  and then multiply that number with Pi  my attempt at this is below  But a contains gibberish  For example  if I insert 22  then a contains 50  What am I doing wrong  I don t get any compiler errors   double a b  a   Console Read    b   a   Math PI  Console WriteLine b

User · Answer

Console Read   takes a character and returns the ascii value of that character So if you want to take the symbol that was entered by the user instead of its ascii value  ex if input is 5 then symbol   5  ascii value is 53   you have to parse it using int parse   but it raises a compilation error because the return value of Console Read   is already int type  So you can get the work done by using Console ReadLine   instead of Console Read   as follows   int userInput   int parse Console ReadLine       here  the output of the Console ReadLine   would be a string containing a number such as  53  By passing it to the int Parse   we can convert it to int type

User · Answer

a   double Parse Console ReadLine       Beware that if the user enters something that cannot be parsed to a double  an exception will be thrown   Edit   To expand on my answer  the reason it s not working for you is that you are getting an input from the user in string format  and trying to put it directly into a double  You can t do that  You have to extract the double value from the string first   If you d like to perform some sort of error checking  simply do this   if   double TryParse Console ReadLine    out a        Console Writeline  Sonu      a   Math PI       else     Console WriteLine  Invalid number entered  Please enter number in format             Thanks to   yvind and abatischev for helping me refine my answer

User · Answer

Sometime in the future  NET4 6    for Double double inputValues   double Parse Console ReadLine        for Int int inputValues   int Parse Console ReadLine

User · Answer

string str   Console ReadLine      Reads a character from console double a   double Parse str     Converts str into the type double double b   a   Math PI     Multiplies by PI Console WriteLine   0    b      Writes the number to console   Console Read   reads a string from console A SINGLE CHARACTER AT A TIME  but waits for an enter before going on  You normally use it in a while cycle   So if you write 25   Enter  it will return the unicode value of 2 that is 50  If you redo a second Console Read   it will return immediately with 53  the unicode value of 5   A third and a fourth Console Read   will return the end of line carriage characters  A fifth will wait for new input   Console ReadLine   reads a string  so then you need to change the string to a double

User · Answer

You re missing a semicolon  double b   a   Math PI

User · Answer

I think there are some compiler errors    Writeline should be WriteLine  capital  L   missing semicolon at the end of a line      double a  b      Console WriteLine  istenen sayiyi sonuna  00 koyarak yaz        a   double Parse Console ReadLine         b   a   Math PI     Missing colon      Console WriteLine  Sonu       b

User · Answer

double a b          Console WriteLine  istenen sayiyi sonuna  00 koyarak yaz            try                       a   Convert ToDouble Console ReadLine                 b   a   Math PI              Console WriteLine  Sonu       b                      catch  Exception                        Console WriteLine  d  n  st  rme hatasi                throw

User · Answer

I m not sure what your problem is  since you haven t told us   but I m guessing at   a   Console Read      This will only read one character from your Console   You can change your program to this  To make it more robust  accept more than 1 char input  and validate that the input is actually a number   double a  b  Console WriteLine  istenen sayiyi sonuna  00 koyarak yaz    if  double TryParse Console ReadLine    out a       b   a   Math PI    Console WriteLine  Sonu       b      else       user gave an illegal input  Handle it here

User · Answer

string input   Console ReadLine    double d  if   Double TryParse input  out d       Console WriteLine  Wrong input    double r   d   Math Pi  Console WriteLine r       The main reason of different input output you re facing is that Console Read   returns char code  not a number you typed  Learn how to use MSDN

[c#] How can I read user input from the console?

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