Oct 21, 2006  What does printf do? C / C Forums on Bytes. I have a question: what does printf do? I have seen it a lot, but cannot find a clear description of what it does. In my learn c in 21 days book, it states that it will not teach it in the book. Thanks, -Brad.

1. C++ Printf To String
2. Printf In C Programming
3. How To Use Printf In C++
4. How To Printf In C

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Dec 28, 2010  You need to #include to use printf by the way. Also, don't worry about the speed of printf vs. That of std::cout. If there is a difference, it will be small, and not worth sacrificing the extra safety that using C strings over C. May 28, 2014  In this tutorial, we have explained printf and scanf functions in C that are used to read input and write output from command line or Console. For more such videos and updates, subscribe to our. Jan 23, 2010  Okay, if I ever use the printf or cont function, the window will quickly close itself out. I know how to fix this when I am using the cont function (by putting cin.ignore right after it), but how do I fix this when using the printf function. Can anyone help me? I accidently put D-C in the topic title, it should read Dev-C. Get notifications on updates for this project. Get the SourceForge newsletter. Get newsletters and notices that include site news, special offers and exclusive discounts about IT.

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The printf() function prints output to stdout, according to format and other arguments passed to printf(). The string format consists of two types of items - characters that will be printed to the screen, and format commands that define how the other arguments to printf() are displayed. Basically, you specify a format string that has text in it, as well as 'special' characters that map to the other arguments of printf(). For example, this code

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displays the following output:

The %s means, 'insert the first argument, a string, right here.' The %d indicates that the second argument (an integer) should be placed there. There are different %-codes for different variable types, as well as options to limit the length of the variables and whatnot.

A field-length specifier may appear before the final control character to indicate the width of the field:

• h, when inserted inside %d, causes the argument to be a short int.
• l, when inserted inside %d, causes the argument to be a long.
• l, when inserted inside %f, causes the argument to be a double.
• L, when inserted inside %d or %f, causes the argument to be a long long or long double respecively.

An integer placed between a % sign and the format command acts as a minimum field width specifier, and pads the output with spaces or zeros to make it long enough. If you want to pad with zeros, place a zero before the minimum field width specifier:

You can also include a precision modifier, in the form of a .N where N is some number, before the format command:

The precision modifier has different meanings depending on the format command being used:

• With %e, %E, and %f, the precision modifier lets you specify the number of decimal places desired. For example, %12.6f will display a floating number at least 12 digits wide, with six decimal places.
• With %g and %G, the precision modifier determines the maximum number of significant digits displayed.
• With %s, the precision modifier simply acts as a maximum field length, to complement the minimum field length that precedes the period.

All of printf()'s output is right-justified, unless you place a minus sign right after the % sign. For example,

will display a floating point number with a minimum of 12 characters, 4 decimal places, and left justified. You may modify the %d, %i, %o, %u, and %x type specifiers with the letter l and the letter h to specify long and short data types (e.g. %hd means a short integer). The %e, %f, and %g type specifiers can have the letter l before them to indicate that a double follows. The %g, %f, and %e type specifiers can be preceded with the character '#' to ensure that the decimal point will be present, even if there are no decimal digits. The use of the '#' character with the %x type specifier indicates that the hexidecimal number should be printed with the '0x' prefix. The use of the '#' character with the %o type specifier indicates that the octal value should be displayed with a 0 prefix.

Inserting a plus sign '+' into the type specifier will force positive values to be preceded by a '+' sign. Putting a space character ' ' there will force positive values to be preceded by a single space character.

You can also include constant escape sequences in the output string.

The return value of printf() is the number of characters printed, or a negative number if an error occurred.

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C++ Printf To String

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