某手机公司的笔试题

naonao

1.      Write a function that prints the binary representation of an unsigned integer using only putchar() for output

2.      Memory Management/Pointer manipulation
Write a function that allows you to remove a substring from a string and returns a new string that uses only the amount of storage needed
Assume: All arguments are always valid
     The original string should remain untouched
Use the following function prototype
char * remove_substr(char *str, int pos, int length);

【文件名】:06119@52RD_某手机公司的笔试题.txt
【格　式】:txt
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kinghu

垃圾！

tritium

还英文的？

yangfan30

1.
void bin_dump_uint(unsigned int input)
{
    int i = sizeof(unsigned int)*8 - 1;

    while (i >= 0)
    {
        putchar('0' + (input>>i & 1));
        if (i%8 == 0)
            putchar(' ');
        --i;
    }
}

2.
char *remove_substr(char *str, unsigned int pos, unsigned int len)
{
    int i;
    char *temp, *sub_str = NULL;
    unsigned int org_len = strlen(str);

    if (pos > org_len)
        return NULL;

    if (len > org_len-pos)
        len = org_len-pos;

    temp = sub_str = (char*)malloc(org_len-len+1);
    if (!sub_str)
        return NULL;
    memset(sub_str, 0x00, org_len-len+1);

    for (i = 0; *str; ++i, ++str)
    {
        if (i < pos || i >= pos+len)
        {
            *temp = *str;
            ++temp;
        }
    }
    *temp = 0;

    return sub_str;
}