using defined characters as strings

[Martijn]

Hi,

I think I can best ask my question by example. I may be overlooking
something, but this is like what I have:

#define ID1 'i'
#define ID2 'd'
#define ID3 'n'

This is what I want in my output file:

i=100:d=200:n=300

This is what I do:

sprintf("%c=%d:%c=%d:%c=%d\n",
ID1, 100,
ID2, 200,
ID3, 300);

That means that the characters are inserted run-time. Is there a way to
make them part of the string-constant so that I can put them into my string
compile-time?

Sorry if the question is formulated somewhat strange Thanks for any
help!

 

[Michael Mair]

Hi,

I think I can best ask my question by example. I may be overlooking
something, but this is like what I have:

#define ID1 'i'
#define ID2 'd'
#define ID3 'n'

This is what I want in my output file:

i=100:d=200:n=300

This is what I do:

sprintf("%c=%d:%c=%d:%c=%d\n",

You either forgot the buffer or use the wrong *printf() function.

ID1, 100,
ID2, 200,
ID3, 300);

That means that the characters are inserted run-time. Is there a way to
make them part of the string-constant so that I can put them into my string
compile-time?

Sorry if the question is formulated somewhat strange Thanks for any
help!

Does
#define STRINGIZE(S) #S
#define XSTR(S) STRINGIZE(S)

#define ID1 i

....
printf(XSTR(ID1)"=%d",100)

help you or do you need the character constants elsewhere?


Cheers
Michael

 

[CBFalconer]

Hi,

I think I can best ask my question by example. I may be overlooking
something, but this is like what I have:

#define ID1 'i'
#define ID2 'd'
#define ID3 'n'

This is what I want in my output file:

i=100:d=200:n=300

This is what I do:

sprintf("%c=%d:%c=%d:%c=%d\n",
ID1, 100,
ID2, 200,
ID3, 300);

That means that the characters are inserted run-time. Is there a way to
make them part of the string-constant so that I can put them into my string
compile-time?

sprintf("i=%d:d=%d:n=%d\n", 100, 200, 300);

 

[Joona I Palaste]

sprintf("i=%d:d=%d:n=%d\n", 100, 200, 300);

A very nice solution, but you're still using sprintf() in the wrong way.
Do you mean printf()?

 

[CBFalconer]

A very nice solution, but you're still using sprintf() in the
wrong way. Do you mean printf()?

Yup. I guess the OP did also.

 

[Barry Schwarz]

Hi,

I think I can best ask my question by example. I may be overlooking
something, but this is like what I have:

#define ID1 'i'
#define ID2 'd'
#define ID3 'n'

This is what I want in my output file:

i=100:d=200:n=300

This is what I do:

sprintf("%c=%d:%c=%d:%c=%d\n",
ID1, 100,
ID2, 200,
ID3, 300);

That means that the characters are inserted run-time. Is there a way to
make them part of the string-constant so that I can put them into my string
compile-time?

If you change the defines to specify double quotes (") instead of
single quotes ('), then your format string can be coded as
ID1 "=%d:" ID2 "=%d:" ID3 "=%d\n"
since the compiler will automatically merge adjacent quoted strings
together.


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