visual c++: convert int into string pointer

Question

how to convert integer into string pointer in visual c++?

Answer 1

You got homework? a generic one, tested if g++, http://effocore.googlecode.com/svn/trunk/devel/effo/codebase/addons/inl/include/impl/algo_impl.h :

#ifdef __cplusplus

static inline char *int2a_put(uintptr_t i, char *s)
{
    do {
        *s++ = '0' + i % 10;
        i /= 10;
    } while (i);

    return s;
}

static inline void int2a_reverse(char *head, char *tail)
{
    for (*tail = '\0'; --tail > head; ++head) {
        /* exchange */
        (*head) ^= (*tail);
        (*tail) ^= (*head);
        (*head) ^= (*tail);
    }
}

template
static inline const char *int2a(t i, char *s)
{
    char *p;
    char *ret = s;
    bool f = false;

    p = s;
    if (i < 0) { 
        *p++ = '-';
        ++ s;
        /* 
         * In limits.h, INT_MAX was defined as 
         *   maximum values a `signed int' can hold.
         * and LONG_MAX was defined as maximum values 
         *   a `signed long int' can hold. 
         */
        switch (sizeof(t)) {
        case 8:
            {
                /* 
                 * Inject \p a to prevent from complaint 
                 *   of compiler.
                 */
                ef64_t a = (ef64_t)i;
                if (-LLONG_MAX > a) {
                    i = (t)LLONG_MAX;
                    f = true;
                }
            }
            break;
        case 4:
        case 2:
        case 1:
            {
                /* 
                 * Inject \p a to prevent from complaint 
                 *   of compiler. 
                 */
                int a = (int)i;
                if (-INT_MAX > a) {
                    i = (t)INT_MAX;
                    f = true;
                }
            }
            break;
        default:
            break;
        }
        if (!f) {
            i = -i;
        }
    }

    p = int2a_put((uintptr_t)i, p);

    if (f) {
        ++ *s;
    }

    int2a_reverse(s, p);

    return ret;
}

/*
 * No "static" otherwise g++ complains 
 *   "explicit template specialization cannot have a storage class"
 */
template<>
/*static*/ inline 
const char *int2a(uintptr_t i, char *s)
{
    char *p = int2a_put(i, s);

    int2a_reverse(s, p);

    return s;
}

#else