int wrong value being printed?

Code:

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int test = 012452;
printf("\n%d", test);

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why is the printed result:

5418

nb: it happens to ints that have a 0 as the first digit ??

Zero is false, so in some terms it is skipped, I use C++, so I could be wrong

I think 0 in the front means the number is counted as octal.

is the only way of getting around it is to make test a string? or can i keep as an int and somehow manipulate it?

Quote:

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Originally Posted by Axel

nb: it happens to ints that have a 0 as the first digit ??

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Yes, the 0 prefix denotes that the number is represented in the octal number system (See the first line on pg 193, K&R 2nd Edition).

In printf, %d means decimal integer, so it's printing it in the decimal format.

Try printing it in octal form using

Code:

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printf("\n%o", test);

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hmm this time it omits the 0..

Code:

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int test =  012345;
printf("\n%o", test);

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12345

Quote:

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See the first line on pg 193, K&R 2nd Edition

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WT*?

Quote:

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Originally Posted by Axel

hmm this time it omits the 0..

Code:

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int test =  012345;
printf("\n%o", test);

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12345

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It would have to be this (if I remmember correctly):

Code:

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int test =  012345;
printf("\n%06o", test);

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But I'm not sure if you want to limmit test to just having digits 0-7.

Or

Code:

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int main()
{
    int test =  012345;
    printf("\n%#o", test);
    return(0);
}

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Or:

Code:

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#include <stdio.h>

int main(void) {
    const char *test = "0123456";
    puts(test);
    return 0;
}

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If you don't know how many zeros precede the number then you're stuck with using a string representation like my sample above.

Axel: you know what octal is?

King Mir: it is just an integer. If it's in octal, then its digits are [0-7]. If decimal, then [0-9]. If hex then [0-9a-f]. It's the same integer in either case. Digital representation has nothing to do with the values an integer can take on.

that's saying, hey, here, i have a number in octal and on the printf, please represent it in decimal

Code:

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printf("%d", test);

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and by any chance, 5418 is decimal for 12452 in octal

:D