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diff --git a/3637/CH4/EX4.4/Ex4_4.pdf b/3637/CH4/EX4.4/Ex4_4.pdf
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diff --git a/3637/CH4/EX4.4/Ex4_4.sce b/3637/CH4/EX4.4/Ex4_4.sce
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+//problem 4 pagenumber 4.39
+//given
+n=12;format(6);
+r=8e-3;//volt
+z='011101110001';
+//determine output voltage
+vof=r*(2^n-1);res=r/vof;
+v0=r*base2dec(z,2);
+disp('Output voltage = '+string(v0)+' volt');
+disp('Fullscale Output Voltage = '+string(vof)+' volt');
+disp('Resolution = '+string(res*1e2)+' percent');