C programming: Printing leading 0's in C

Print with padding by Zeros in C.

The printf() statement can be used with the following format specifier to print with padding by zeros.

• %d : No padding
• %01d : 1 digit padding with zeros
• %02d : 2 digits padding with zeros
• %03d : 3 digits padding with zeros
• %04d : 4 digits padding with zeros
• %05d : 5 digits padding with zeros

Code:

# include <stdio.h>
int main ()
{
	int x = 123;
	printf ("2 digits padding: %02d\n\n", x);
	printf ("3 digits padding: %03d\n\n", x);
	printf ("4 digits padding: %04d\n\n", x);
	printf ("5 digits padding: %05d\n\n", x);
	printf ("6 digits padding: %06d\n\n", x);
	return 0;
}

Output:

2 digits padding: 123

3 digits padding: 123

4 digits padding: 0123

5 digits padding: 00123

6 digits padding: 000123