Convert char to int in C

Question

I have a char in c    char foo    2     Now I want to get the 2 into an int   I find that Convert ToInt32 returns the actual decimal value of the char and not the number 2   The following will work   int bar   Convert ToInt32 new string foo  1      int parse only works on strings as well     Is there no native function in C  to go from a char to int without making it a string   I know this is trivial but it just seems odd that there s nothing native to directly make the conversion

User · Answer

I am agree with  Chad Grant  Also right if you convert to string then you can use that value as numeric as said in the question  int bar   Convert ToInt32 new string foo  1         gt  gives bar 2   I tried to create a more simple and understandable example  char v    1   int vv    int char GetNumericValue v      char GetNumericValue v  returns as double and converts to  int   More Advenced usage as an array  int   values    41234  ToArray   Select c  gt   int char GetNumericValue c   ToArray

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Has anyone considered using int Parse   and int TryParse   like this  int bar   int Parse foo ToString       Even better like this  int bar  if   int TryParse foo ToString    out bar           Do something to correct the problem     It s a lot safer and less error prone

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I m using Compact Framework 3 5  and not has a  char Parse  method  I think is not bad to use the Convert class   See CLR via C   Jeffrey Richter   char letterA   Convert ToChar 65   Console WriteLine letterA   letterA        ushort valueA   Convert ToUInt16 letterA   Console WriteLine valueA   char japaneseA   Convert ToChar valueA   Console WriteLine japaneseA     Works with ASCII char or Unicode char

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Principle   char foo    2   int bar   foo  amp  15    The binary of the ASCII charecters 0-9 is   0     -     0011 0000 1     -     0011 0001 2     -     0011 0010 3     -     0011 0011 4     -     0011 0100 5     -     0011 0101 6     -     0011 0110 7     -     0011 0111 8     -     0011 1000 9     -     0011 1001   and if you take in each one of them the first 4 LSB  using bitwise AND with 8 b00001111 that equals to 15  you get the actual number  0000   0 0001 1 0010 2        Usage   public static int CharToInt char c        return 0b0000 1111  amp   byte  c

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Try This  char x    9       9    ASCII 57  int b   x -  0     That is  9  -  0    57 - 48   9

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This will convert it to an int   char foo    2   int bar   foo -  0     This works because each character is internally represented by a number  The characters  0  to  9  are represented by consecutive numbers  so finding the difference between the characters  0  and  2  results in the number 2

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Try This  char x    9       9    ASCII 57  int b   x -  0     That is  9  -  0    57 - 48   9

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I ve seen many answers but they seem confusing to me  Can t we just simply use Type Casting   For ex -  int s  char i   2   s    int  i

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Principle   char foo    2   int bar   foo  amp  15    The binary of the ASCII charecters 0-9 is   0     -     0011 0000 1     -     0011 0001 2     -     0011 0010 3     -     0011 0011 4     -     0011 0100 5     -     0011 0101 6     -     0011 0110 7     -     0011 0111 8     -     0011 1000 9     -     0011 1001   and if you take in each one of them the first 4 LSB  using bitwise AND with 8 b00001111 that equals to 15  you get the actual number  0000   0 0001 1 0010 2        Usage   public static int CharToInt char c        return 0b0000 1111  amp   byte  c

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This converts to an integer and handles unicode  CharUnicodeInfo GetDecimalDigitValue  2    You can read more here

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char c    1   int i    int  c- 0      and you can create a static method out of it   static int ToInt this char c        return  int  c -  0

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char c    1   int i    int  c- 0      and you can create a static method out of it   static int ToInt this char c        return  int  c -  0

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Interesting answers but the docs say differently      Use the GetNumericValue methods to   convert a Char object that represents   a number to a numeric value type  Use   Parse and TryParse to convert a   character in a string into a Char   object  Use ToString to convert a Char   object to a String object    http   msdn microsoft com en-us library system char aspx

User · Answer

char c    1   int i    int  c- 0      and you can create a static method out of it   static int ToInt this char c        return  int  c -  0

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I ve seen many answers but they seem confusing to me  Can t we just simply use Type Casting   For ex -  int s  char i   2   s    int  i

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This worked for me   int bar   int Parse      foo

User · Answer

This converts to an integer and handles unicode  CharUnicodeInfo GetDecimalDigitValue  2    You can read more here

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By default you use UNICODE so I suggest using faulty s method   int bar   int Parse foo ToString      Even though the numeric values under are the same for digits and basic Latin chars

User · Answer

I am agree with  Chad Grant  Also right if you convert to string then you can use that value as numeric as said in the question  int bar   Convert ToInt32 new string foo  1         gt  gives bar 2   I tried to create a more simple and understandable example  char v    1   int vv    int char GetNumericValue v      char GetNumericValue v  returns as double and converts to  int   More Advenced usage as an array  int   values    41234  ToArray   Select c  gt   int char GetNumericValue c   ToArray

User · Answer

By default you use UNICODE so I suggest using faulty s method   int bar   int Parse foo ToString      Even though the numeric values under are the same for digits and basic Latin chars

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Comparison of some of the methods based on the result when the character is not an ASCII digit  char c1    char   0  - 1   c2    char   9    1     Debug Print   quot  c1  amp  15    c2  amp  15  quot                                         15  10 Debug Print   quot  c1    0     c2    0   quot                                       31  10 Debug Print   quot  c1 -  0     c2 -  0   quot                                       -1  10 Debug Print   quot   uint c1 -  0      uint c2 -  0   quot                           4294967295  10 Debug Print   quot  char GetNumericValue c1     char GetNumericValue c2   quot       -1  -1

User · Answer

This will convert it to an int   char foo    2   int bar   foo -  0     This works because each character is internally represented by a number  The characters  0  to  9  are represented by consecutive numbers  so finding the difference between the characters  0  and  2  results in the number 2

User · Answer

This will convert it to an int   char foo    2   int bar   foo -  0     This works because each character is internally represented by a number  The characters  0  to  9  are represented by consecutive numbers  so finding the difference between the characters  0  and  2  results in the number 2

User · Answer

Has anyone considered using int Parse   and int TryParse   like this  int bar   int Parse foo ToString       Even better like this  int bar  if   int TryParse foo ToString    out bar           Do something to correct the problem     It s a lot safer and less error prone

User · Answer

Interesting answers but the docs say differently      Use the GetNumericValue methods to   convert a Char object that represents   a number to a numeric value type  Use   Parse and TryParse to convert a   character in a string into a Char   object  Use ToString to convert a Char   object to a String object    http   msdn microsoft com en-us library system char aspx

User · Answer

The real way is      int theNameOfYourInt    int  Char GetNumericValue theNameOfYourChar      theNameOfYourInt  - the int you want your char to be transformed to    theNameOfYourChar  - The Char you want to be used so it will be transformed into an int   Leave everything else be

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char c    1   int i    int  c- 0      and you can create a static method out of it   static int ToInt this char c        return  int  c -  0

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This worked for me   int bar   int Parse      foo

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Comparison of some of the methods based on the result when the character is not an ASCII digit  char c1    char   0  - 1   c2    char   9    1     Debug Print   quot  c1  amp  15    c2  amp  15  quot                                         15  10 Debug Print   quot  c1    0     c2    0   quot                                       31  10 Debug Print   quot  c1 -  0     c2 -  0   quot                                       -1  10 Debug Print   quot   uint c1 -  0      uint c2 -  0   quot                           4294967295  10 Debug Print   quot  char GetNumericValue c1     char GetNumericValue c2   quot       -1  -1

User · Answer

Has anyone considered using int Parse   and int TryParse   like this  int bar   int Parse foo ToString       Even better like this  int bar  if   int TryParse foo ToString    out bar           Do something to correct the problem     It s a lot safer and less error prone

User · Answer

The real way is      int theNameOfYourInt    int  Char GetNumericValue theNameOfYourChar      theNameOfYourInt  - the int you want your char to be transformed to    theNameOfYourChar  - The Char you want to be used so it will be transformed into an int   Leave everything else be

User · Answer

Has anyone considered using int Parse   and int TryParse   like this  int bar   int Parse foo ToString       Even better like this  int bar  if   int TryParse foo ToString    out bar           Do something to correct the problem     It s a lot safer and less error prone

User · Answer

This will convert it to an int   char foo    2   int bar   foo -  0     This works because each character is internally represented by a number  The characters  0  to  9  are represented by consecutive numbers  so finding the difference between the characters  0  and  2  results in the number 2

User · Answer

I m using Compact Framework 3 5  and not has a  char Parse  method  I think is not bad to use the Convert class   See CLR via C   Jeffrey Richter   char letterA   Convert ToChar 65   Console WriteLine letterA   letterA        ushort valueA   Convert ToUInt16 letterA   Console WriteLine valueA   char japaneseA   Convert ToChar valueA   Console WriteLine japaneseA     Works with ASCII char or Unicode char

[c#] Convert char to int in C#

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