Converting int to string without using itoa

Question

#include <stdio.h>
//#include <<strong class="highlight">string</strong>.h>

// Function declarations
// typedef __w64 unsigned int size_t
size_t strlen(const char *);
char *strrev(char *);
char *itoa(int, char *, int);

int main() {
    int num = 123;
    char buf[5];

    itoa(num, buf, 10);

    printf("%s\n", buf);

    return 0;
}

size_t strlen(const char *string) {
    const char *s;

    s = <strong class="highlight">string</strong>;
    while (*s)
        s++;
    return s - <strong class="highlight">string</strong>;
}

char *strrev(char *str) {
    char *p1, *p2;

    if (!str || !*str)
        return str;

    for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2) {
        *p1 ^= *p2;
        *p2 ^= *p1;
        *p1 ^= *p2;
    }

    return str;
}

char *itoa(int n, char *s, int b) {
    static char digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
    int i=0, sign;

    if ((sign = n) < 0)
        n = -n;

    do {
        s[i++] = digits[n % b];
    } while ((n /= b) > 0);

    if (sign < 0)
        s[i++] = '-';
    s[i] = '\0';

    return strrev(s);
}

getting error on this part of the question...

s = string; while (*s) s++; return s - string;

saying missing 'class' : missing tag name and syntax error: <

I don't know how to fix it.. trying various stuff..

any help would be appreciated..

thanks alot

If this isn't homework, then why would you bother doing this? — Marvo
– Marvo, Commented Oct 28, 2011 at 0:13
@RayToal: I think the HTML you just edited out of the question was the cause of the problem (note the < in the error message). — Keith Thompson
– Keith Thompson, Commented Oct 28, 2011 at 0:18
with the HTML stripped out, it compiles and runs as expected for me. — hex4def6
– hex4def6, Commented Oct 28, 2011 at 0:19
If you're interested in implementing int to string formatting, have a gander at my question here: stackoverflow.com/questions/4351371/… — Ben Voigt
– Ben Voigt, Commented Oct 28, 2011 at 0:24

Keith Thompson · Accepted Answer · 2011-10-28 00:16:43Z

3

It looks like you've somehow gotten HTML markup into your C++ source code:

s = <strong class="highlight">string</strong>;
while (*s)
    s++;
return s - <strong class="highlight">string</strong>;

I would have gone ahead and fixed it, but the error message refers to a < character, so I think that's your actual problem. Perhaps you incorrectly copy-and-pasted the code from some web page?

EDIT: I see @RayToal has edited the HTML out of your question.

answered Oct 28, 2011 at 0:16

Keith Thompson

266k46 gold badges447 silver badges668 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

sth Over a year ago

I tested it and you get the errors mentioned in the question when you try to compile the code including the HTML markup. So you are most likely right that this is the problem.

Collectives™ on Stack Overflow

Converting int to string without using itoa

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related