源码成绩管理系统.c实现的是一个简单的教学管理系统。源码LINGXING.c实现的是由*形成的空心菱形，空心菱形有行数由N控制-Performance management system source code. C is a simple realization of the teaching management system. LINGXING.c source is achieved by* diamond-shaped formation of the hollow, hollow d