VB代码转 VC该如何写 谢谢

Question_String As String
Dim x2 As Byte,

Question_String = Question_String & String(2 - Len(Hex(x2)), "0") & Hex(x2)

这段VB代码用VC中如何写

有知道的朋友吗 可否指点下我

C语言的

char x2, a[256], Question_String[256] = "";

....

sprintf(a, "%02X", ch);

strcat(Question_String, a);