Question

::::::::::::::: c program :::::::::::::::
#include void main() { int i=-0777; printf("%d",i); } explain why the output comes -551

Answer 1

That is because in C the leading 0 makes C tread the number as an octal an 0777 octal does indeed equal 511 decimal.

Answer 2

tread=treat and 511 should be 551

Answer 3

actually I do get 511 so I am guessing the 551 was a typo

Answer 4

You can test it with 0977 and you will get an error like ... error: invalid digit "9" in octal constant

Answer 5

when you put "0" before any number , compiler will take it as octal number.
and dec number of 777 is 551 , so you are getting 551.

btw what exactly do you want to do?

Answer 6

If you want to print octal value only then try following c program:-


#include <stdio.h>
void main()
{
int i=0777;
printf("i=%o \n",i);
}