从文件读取7路数字信号(存储为char型)， 输出2路信号是输入信号的当前值与前2次

的逻辑组合。用屏幕和文件分别输出信号，用字符代表光点模拟输出结果波形。输出

结果由已有函数intf1(char d2,char d1,char d)，intf2(char d2,char d1,char d)

给出 函数的输入参数d2,d1,d分别用低7位表示7路前2次信号及当前信号-7 digital signals read from the file (stored as char type), output signal is the current value of the input signal is 2 and 2 times before

The logic of the combination. With the screen and the file output signals, respectively, using character represents the simulation output waveform. The output

Results by the existing function intf1 (char d2, char d1, char d), intf2 (char d2, char d1, char d)

Function of input parameters is given d2 and d1, d respectively expressed in low seven 7 road 2 times before signal and current signal