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汉语拼音：sì zé yùn suàn

加、减、乘、除四种运算的统称。在一个算式里，若既有加或减，又有乘或除，称为四则混合运算。在数、代数式和各种函数表达式之间都可进行四则运算，一般把加法和减法称为第一级运算，把乘法和除法称为第二级运算。

• The four operations are the basis of math.

  四则运算是数学的基础.

• The arithmetic operation of the general interval numbers has wide applications.

  广义区间数的算术四则运算有广泛应用.

• Generation Visual friendly interface, like with ordinary calculators, are also more functional whole.

  四则运算小程序.生成可视化友好的界面, 跟普通计算器很像, 功能也还比较全.

• Compilation Principle 4 lr priority computing algorithm has been tested, you can run ~!

  编译原理lr四则运算优先算法,已经测试, 可以运行~!