antlr4 calculator:简单的antlr4计算器 源码

入门 安装ANTLR v4() 生成ANTLR文件antlr4 Calculator.g4 -no-listener -visitor -o app 复制访客实现cp *.java app 编译javac app/*.java 跑 输入控制台cd app && java Run a = 1+2 b = a^2 c = a + b * (a - 1) a + b + c 结果应等于33.0