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+// to find the amplitude,frequency and the phase difference b/w two waveforms in the figure 9-20
+// example 9-3 in page 256
+clc;
+//Data Given
+x=['A' 'B'];
+V=200D-3;// volatge/division=200mV
+T=0.1D-3;//time/division=0.1ms
+one_cycle=360;// one cycle=360 degree
+Vd=[6 2.4];// vertical divisions of A and B respectively
+Hd=[6 7];// horizontal divisions of A and B respectively
+//calculation
+for n=1:2
+    Vp=Vd(n)*V;// V peak-to-peak
+    Tp=T*Hd(n);// time period
+    f=1/Tp;//frequency
+    printf("V peak-peak of wave from %c=%.2f V\n",x(n),Vp);
+    printf("frequency of wave form %c=%.0f Hz\n",x(n),f);
+end
+phase_diff=Hd(2)-Hd(1);
+phase_diff=one_cycle*phase_diff/6;// here one cycle makes 6 horizontal divisions
+printf("phase difference=%d degree",phase_diff);
+//result
+//V peak-peak of wave from A=1.20 V
+//frequency of wave form A=1667 Hz
+//V peak-peak of wave from B=0.48 V
+//frequency of wave form B=1429 Hz
+//phase difference=60 degree