c++ 里如何居中显示

看cout的定义。可以定义输出的宽度
不过没居中这个说法。
自己写个函数实现就over了。。。

如下：
#include <windows.h>
#include <stdio.h>

void ConPrint(char *CharBuffer, int len);
void ConPrintAt(int x, int y, char *CharBuffer, int len);
void gotoXY(int x, int y);
void ClearConsole(void);
void ClearConsoleToColors(int ForgC, int BackC);
void SetColorAndBackground(int ForgC, int BackC);
void SetColor(int ForgC);
void HideTheCursor(void);
void ShowTheCursor(void);

int main(int argc, char* argv[])
{
HideTheCursor();
ClearConsoleToColors(15, 1);
ClearConsole();
gotoXY(1, 1);
SetColor(14);
printf("This is a test...\n");
Sleep(5000);
ShowTheCursor();
SetColorAndBackground(15, 12);
ConPrint("This is also a test...\n", 23);
SetColorAndBackground(1, 7);
ConPrintAt(22, 15, "This is also a test...\n&quo