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