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C Programming

How to print % using printf()?

Here is the standard prototype of printf function in C.

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


The format string is composed of zero or more directives: ordinary characters (not %), which are copied unchanged to the output stream; and conversion specifications, each of argument (and it is an error if insufficiently many arguments are given).

The character % is followed by one of the following characters.

The flag character
The field width
The precision
The length modifier
The conversion specifier:

See http://swoolley.org/man.cgi/3/printf for details of all the above characters. The main thing to note in the standard is the below line about conversion specifier.

A %' is written. No argument is converted. The complete conversion specification is%%'.


So we can print “%” using “%%”

/* Program to print %*/
#include<stdio.h>
/* Program to print %*/
int main()
{
printf("%%");
getchar();
return 0;
}


We can also print “%” using below.

printf("%c", '%');
printf("%s", "%");