使用C语言编写的具有简单计算功能的计算器，可以完成加、减、乘、除、sin、cos、tan、cot运算，并且有界面。适合初级C语言编程人员学习。-Calculator using C language with a simple calculation function, you can complete the addition, subtraction, multiplication, addition to, sin, cos, of tan, cot computing and inter