Dev C++ Printf Float

Nov 01, 2007  float a = 12.5; printf('%dn', a); This line is wrong because printf expects an int but a is a float. Note that because this is undefined behaviour (UB), this may cause a crash on some C compilers - and even worse behaviour on others. To think about one reason this may crash on a machine with a stack, if.

Float

Printf Float Format

I have a column of floating point data that I need to right justify and align the decimal points. Help.

Combinatorial optimization cook download. Data looks something like this.

30.768
1.345
.430

  • C: What is the printf format spec for float? (Visual C) It used to be that I used%g for float and%lg for double. It looks like the spec changed and float is undefined and double is%g. I have bits in memory that I am printing out so casting is not an option. Is there a way that I can print out float values using printf?
  • Decimal 0.7 cannot be represented in binary exactly 2. Type of 0.7 is double, the value is: 0.11b 3.

I am using Dev C 4.9.9.2 and first of all, I have to flush the carriage return out several times if it's not read previously. So if there is any alternative there. Summary: This page is a printf formatting cheat sheet. I originally created this cheat sheet for my own purposes, and then thought I would share it here. A great thing about the printf formatting syntax is that the format specifiers you can use are very similar — if not identical — between different languages, including C, C, Java, Perl, PHP, Ruby, Scala, and others. A valid floating point number for strtof using the 'C' locale is formed by an optional sign character (+ or -), followed by one of: A sequence of digits, optionally containing a decimal-point character (.), optionally followed by an exponent part (an e or E character followed by an optional sign and a sequence of digits). For representing floating point numbers, we use float, double and long double. What’s the difference? Double has 2x more precision then float. Float is a 32 bit IEEE 754 single precision Floating Point Number1 bit for the sign, (8 bits for the exponent, and 23. for the value), i.e. Float has 7 decimal digits of precision.

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When in doubt, use the old workhorse printf(). I have played around with manipulators like [php]cout << setfill('0') << setw(8) << d1;
[/php] with results that cause only consternation. The old printf() like Chainsaw mentioned works well:
[php]// right justified numeric output (Dev-C++)

include // may …
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Chainsaw12

C Printf Float Precision

you could, for example, use printf or sprintf or its ilk. Take a look at the specifications for the strings. You can control right or left justification, leading zeros, number of digits after the decimals, etc.

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Printf Float Double

If your output is using a proportional font, the spaces won't be as wide as the digits, so that can be a problem too; hopefully you will use a non-proportional font, or else you'll have to do placement in some measurement like pixels or inches.