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char+int?????

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char+int?????

 
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  #1
Feb 24th, 2007
I am very new at this, and I am sure this is a really basic question but if I don't know, then I have been taught to ask .... even if it is dumb.

Can a character be added to an interger. I feel confident I would get a syntax error, but wanted to make sure.

Can a character string like "215" be converted to an integer?

Charlie
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Re: char+int?????

 
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  #2
Feb 24th, 2007
It depends what language (C or C++) and what kind of error-checking you need.

A basic function which has no error-checking is atoi():
c Syntax (Toggle Plain Text) 
  1. int myNumber;
  2. myNumber = atoi(myString); // myString had better contain a number!

A better C function in regards to error-checking is strtol. For C++, you'll want to pop it in and out of a stream:
C++ Syntax (Toggle Plain Text) 
  1. istringstream myStream;
  2. myStream.str(myString);
  3. myStream >> myNumber;
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Re: char+int?????

 
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  #3
Feb 25th, 2007
Just to nitpick a li'l: a char and a character string are very different. For a character string, you'll need to do like joeprogrammer says, which would be correct for your example. You can also add the value of a single character (char) to an integer, but remember that a char value is not necessarily it's integer representation. That is '0' != 0, '1' != 1, etc...
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Re: char+int?????

 
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  #4
Feb 25th, 2007
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Originally Posted by Infarction View Post
Just to nitpick a li'l: a char and a character string are very different. For a character string, you'll need to do like joeprogrammer says, which would be correct for your example. You can also add the value of a single character (char) to an integer, but remember that a char value is not necessarily it's integer representation. That is '0' != 0, '1' != 1, etc...
I assumed when he said, "Can a character string like "215" be converted to an integer" that he meant character string, regardless of the thread title.

However, Infarction is correct, for a char conversion, subtraction is all that is necessary:
c Syntax (Toggle Plain Text) 
  1. int myNumber;
  2. myNumber = myChar - '0'; // won't work for a string!
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Re: char+int?????

 
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Feb 25th, 2007
I am seeking clues in C
I'm Learning here ...... Don't give up on me yet.

How about in this case;

[
int A;
float B;
char C;

can the expression A+C*B

work?

I don't see how I can do it.

Charlie
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Re: char+int?????

 
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  #6
Feb 25th, 2007
>can the expression A+C*B work?
Sure. Convert C to an integer first.
c Syntax (Toggle Plain Text) 
  1. float result;
  2. int anotherInteger;
  3. anotherInteger = C - '0';
  4. result = A+anotherInteger*B;

If you didn't convert the char to an integer first, you'd get a much higher value than you expect.
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