# What does it mean when a numeric constant in C/C++ is prefixed with a 0?

CC++Server Side ProgrammingProgramming

Sometimes we may see some numeric literals, which is prefixed with 0. This indicates that the number is octal number. So octal literals contain 0 at the beginning. For example, if an octal number is 25, then we have to write 025.

## Example

#include <stdio.h>
int main() {
int a = 025;
int b = 063;
printf("Decimal of 25(Octal) is %d\n", a);
printf("Decimal of 63(Octal) is %d\n", b);
}

## Output

Decimal of 25(Octal) is 21
Decimal of 63(Octal) is 51
Published on 08-May-2019 12:09:19