请问这几句JAVA代码如何转换成C++代码？

[kuohai123]

returnValue = Integer.toHexString(accumulator).toUpperCase();
for (i=returnValue.length(); i<4; i++)
returnValue = '0' + returnValue;

C++无法获得数组的长度啊

[kuohai123]

String getCRC(byte[] arg) {
int i, accumulator, data, index;
String returnValue = new String();
accumulator = 0xffff;
for (i=0; i<arg.length; i++) {
data = arg[i];
index = (accumulator >> 8) ^ data;
accumulator = (accumulator << 8) ^ this.crcTable[index];
}
accumulator ^= 0xffff;
returnValue = Integer.toHexString(accumulator).toUpperCase();
for (i=returnValue.length(); i<4; i++)
returnValue = '0' + returnValue;
return returnValue;
}

[Java技术栈]

C++无法获得数组的长度啊？？

不会吧。。

[abc130314]

用C写的。

char* g(unsigned int a) {
    char k[] = "0123456789ABCDEF";
    char r[sizeof (a)*2];
    int i = 0;
    while (a != 0) {
        r[i++] = k[a % 16];
        a /= 16;
    }
    while (i < 4) {
        r[i++] = '0';
    }
    char* t = malloc(i + 1);
    int j = 0;
    while (j < i) {
        t[j++] = r[i - 1 - j];
    }
    t[i] = 0;
    return t;
}

[anew2010]

程序没有上下文