How to convert string to integer in C

Question

How do I convert a string to an integer in C

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bool result   Int32 TryParse someString  out someNumeric    This method will try to convert someString into someNumeric  and return a result depends if the conversion is successful  true if conversion is successful and false if conversion failed  Take note that this method will not throw exception if the conversion failed like how Int32 Parse method did and instead it returns zero for someNumeric   For more information  you can read here   https   msdn microsoft com en-us library f02979c7 v vs 110  aspx cs-save-lang 1 amp cs-lang csharp code-snippet-2   amp   How to convert string to integer in C

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string varString    15   int i   int Parse varString     or   int varI  string varString    15   int TryParse varString  out varI     int TryParse is safer since if you put something else in varString  for example  fsfdsfs   you would get an exception  By using int TryParse when string can t be converted into int it will return 0

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4 techniques are benchmarked here   The fastest way turned out to be the following   y   0  for  int i   0  i  lt  s Length  i           y   y   10    s i  -  0       s  is your string that you want converted to an int  This code assumes you won t have any exceptions during the conversion  So if you know your string data will always be some sort of int value  the above code is the best way to go for pure speed   At the end   y  will have your int value

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int i   string result   Something   i   Convert ToInt32 result

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int i  string whatever     Best since no exception raised int TryParse whatever  out i      Better use try catch on this one i   Convert ToInt32 whatever

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You can use either       int i   Convert ToInt32 myString     or      int i  int Parse myString

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int myInt   System Convert ToInt32 myString     As several others have mentioned  you can also use int Parse   and int TryParse     If you re certain that the string will always be an int   int myInt   int Parse myString     If you d like to check whether string is really an int first   int myInt  bool isValid   int TryParse myString  out myInt      the out keyword allows the method to essentially  return  a second value if  isValid        int plusOne   myInt   1

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Do something like   var result   Int32 Parse str

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class MyMath       public dynamic Sum dynamic x  dynamic y                return  x y            class Demo       static void Main string   args                MyMath d   new MyMath            Console WriteLine d Sum 23 2  32 2

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If you re sure it ll parse correctly  use  int Parse string    If you re not  use  int i  bool success   int TryParse string  out i     Caution  In the case below  i will equal 0  not 10 after the TryParse   int i   10  bool failure   int TryParse  asdf   out i     This is because TryParse uses an out parameter  not a ref parameter

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int a   int Parse myString     or better yet  look into int TryParse string

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If you are sure that you have  real  number in your string  or you are comfortable of any exception that might arise  use this   string s  4   int a int Parse s     For some more control over the process  use  string s  maybe 4   int a  if  int TryParse s  out a            it s int    else          it s no int  and there s no exception

[c#] How to convert string to integer in C#

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