printf() - I/O Function

How is "printf()" used in C++?


printf() is an I/O function that prints the formatted data to the stdout. This function returns the total number of characters, but on failure a negative value is returned.


int printf ( const char * format, ... );

The following table lists the type specifier used with printf()
Type Description
c Character
d or i Signed decimal integer
e Scientific notation using e character
E Scientific notation using E character
f Decimal floating point
g Use the shorter of %e or %f
G Use the shorter of %E or %f
o Signed octal
s String of characters
u Unsigned decimal integer
x Unsigned hexadecimal integer
X Unsigned hexadecimal integer(capital)
p Pointer address
% A % followed by another % character will write % to the stream.

Example :

#include <stdio.h>
int main()
printf ("Characters: %c %c \n", 'b',42);
printf ("Decimals: %d %ld\n", 187, 345);
printf ("Preceding blanks: %7d \n", 2010);
printf ("Preceding zeros: %07d \n", 2010);
printf ("Float values : %3.2f %+.0e %E \n",
4.316, 4.2456, 6.1317);
printf ("%s \n", "Hscripts");
return 0; }


Characters: b
Decimals: 1
Preceding blanks:
Preceding zeros: 0002010
Float values : 4.32 +4e+00 6.131700E+00

In the above example the "printf()" is used with different type specifiers.

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