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diff --git a/45/CH2/EX2.2/2_2.jpg b/45/CH2/EX2.2/2_2.jpg
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diff --git a/45/CH2/EX2.2/example_2_2.sce b/45/CH2/EX2.2/example_2_2.sce
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+//exmaple 2.2 
+//7404
+clc
+close
+clear
+//frq= input('Enter the square wave frequency in KHz :');
+frq=0.5 ;//KHz
+t=(1/frq)*100;
+t=round(t)
+for r=1:t*10
+    inputc(r)=0;
+    outputc(r)=0;
+end
+p=1;
+while p<t*10                                   // making arrays t plot the curve 
+    if p==1 | modulo(p,t)==0 then
+        for k=1:t/2
+            inputc(p+k)=0;
+            outputc(p+k)=1;
+        end
+        p=p+t/2;
+        else 
+            inputc(p)=1;
+            outputc(p)=0;
+            p=p+1;
+        end
+end
+y=[3 3];
+subplot(2,1,1)    //ploting the graphs 
+title('input at pin 1')
+xlabel('Time X 10^-5 seconds');
+ylabel('Magnitude')
+plot(inputc)
+plot(y)
+subplot(2,1,2)
+title('output at pin 2')
+xlabel('Time X 10^-5 seconds');
+ylabel('Magnitude')
+plot(outputc)
+plot(y)
+\ No newline at end of file