刚刚学的新手，遇到困难想吧友请教一下怎么回事

#include <stdio.h>
int main (void)
{
char ch;
scanf ("%c", &ch);
getchar();
printf ("%c:%d", ch, ch);
getchar();
return 0;
}
############分割线###################
1>------ 已启动生成: 项目: ConsoleApplication18, 配置: Debug Win32 ------
1> 源.cpp
1>c:\users\泡沫丶\documents\visual studio 2012\projects\consoleapplication18\consoleapplication18\源.cpp(5): error C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
1> d:\软件\microsoft visual studio professional 2012\vc\include\stdio.h(290) : 参见“scanf”的声明
========== 生成: 成功 0 个，失败 1 个，最新 0 个，跳过 0 个 ==========
使用的是Visual Studio 2012，