设计一个计算器，可以实现输入一些数据进行加减乘除，输出正确的答案-The design of a calculator, can achieve input some data to add, subtract, multiply and divide, output the correct answer

4*4计算器 利用并行接口进行键盘扫描，自定义距阵键盘键值，实时显示输入数值，设计的计算器有差错控制功能，能正确进行两位数的加、减、乘、除运算功能。可以进行对输入数据进行编辑，有实时删除功能。配合差错控制，有错误信息提示功能。-4* 4 calculator using the keyboard scan parallel interface, a custom matrix keyboard keys, real-time display input values, there were er

vedic multiplication is used to implement on FPGA. here the vdic multipler uses urdhwa tiryakhbyam sutra to multiply 16 bit numbers, which is applicable for all data type numbers. This uses vertical and cross wise multiplication process. The out