List of format specifiers for printf( ) function - C Language Basics

C examples for Language Basics:printf

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Introduction

Code Format
%a Hexadecimal output in the form 0xh.hhhhp +d (C99 only).
%A Hexadecimal output in the form 0Xh.hhhhP+d (C99 only).
%c Character.
%d Signed decimal integers.
%i Signed decimal integers.
%e Scientific notation (lowercase e).
%E Scientific notation (uppercase E).
%f Decimal floating point.
%g Uses %e or %f, whichever is shorter.
%G Uses %E or %F, whichever is shorter.
%o Unsigned octal.
%s String of characters.
%u Unsigned decimal integers.
%x Unsigned hexadecimal (lowercase letters).
%X Unsigned hexadecimal (uppercase letters).
%p Displays a pointer.
%n The associated argument must be a pointer to an integer.
%% Prints a % sign.

You can use either %d or %i to display a signed integer in decimal format.

To output an unsigned integer, use %u.

The %f format specifier displays numbers in floating point. The matching argument must be of type double.

The %e and %E specifiers tell printf( ) to display a double argument in scientific notation.

Numbers represented in scientific notation take this general form: 

x.dddddE+/-yy

To display the letter E in uppercase, use the %E format; otherwise, use %e.

You can tell printf( ) to use either %f or %e by using the %g or %G format specifiers. This causes printf( ) to select the format specifier that produces the shortest output. Where applicable, use %G if you want E shown in uppercase; otherwise, use %g.

The following program demonstrates the effect of the %g format specifier:

Demo Code

#include <stdio.h>

int main(void)
{
   double f;//from  w w w. j a  va 2  s  .  co m

   for (f = 1.0; f<1.0e+10; f = f * 10)
      printf("%g ", f);

   return 0;
}

Result


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