Zero padding

[manjut19]

Hi i want a C program to convert 2.3 to 0002.3.Please give me any idae.Any in built function is there for this conversion?

[kbw]

That isn't a conversion, it's a display format issue. The numbers are the same.

[manjut19]

K.How to change the format?.I tryed with swprintf but not working

[tath]

here is answer for you: http://cboard.cprogramming.com/c-programming/53968-printf-zero-padding-float.html

[manjut19]

No.Its not working Itryed that one already.Actually the problem with _wtof().
code:

TCHAR *pBuf={"A2.3"};
float f=_wtof(pBuf++);
printf("%06.1f",f)

Output should be

A0002.3

[kbw]

A2.3 is a string. Why aren't you trying to format the number 2.3?

Did you bother to look at the value of f?

[manjut19]

I thought first i convert that string to float no:and format the float no: and append with A.But i am not getting the format 2.3 to 0002.3._wtof function failure is the problem.What may be the reason of _wtof failure.

[keskiverto]

What is TCHAR? What is _wtof? Parameter type, return type? Does it provide any error handling?

If you do have a cstring, then you can measure its length and find the position of the dot. It is then possible to construct a new cstring with appropriate number of "0" characters in front. Converting string->float->string is not so nice due to the nature of floats.

[manjut19]

Its working now

TCHAR *pBuf={"A2.3"};
float f=_wtof(++pBuf);
printf("%05.1f",f) 

[keskiverto]

Good, but could you explain what do you think to be the reason why "it is working" now?

[kbw]

It works because he's (erroneously) incrementing pBuf to step past the "A" and point to "2.3".