几个gtk实例，calc是计算器，tank是键盘响应移动小箭头，jumpinglabel是时钟的使用，primenumber是求最大质数，snake是利用资源文件修改控件外观。-Several gtk example, calc is a calculator, tank is the keyboard to respond to moving small arrow, jumpinglabel is the use of the clock, primenumber is to strive