这是一个C语言（DEV C）开发的表达式计算程序。该程序演示了C语言swtich的基本功能。独立完成该程序，说明你掌握了C语言switch语句的使用。-This is a C language (DEV C) developed expression　uation procedures. This program demonstrates the basic functions of C language swtich . Independently of the program , indicating that you have mastered the use of the C language switch statement.