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+//problem 20 pagenumber 4.46
+//given
+vref=10;//volt
+z=['01','0111','10111100'];format(6);
+n=2;
+v0=vref*(1/2^2);
+disp('Output voltage at '+string(z(1))+' = '+string(v0)+' volt');
+n=4
+v0=vref*(1/2^2+1/2^3+1/2^4);
+disp('Output voltage at '+string(z(2))+' = '+string(v0)+' volt');
+v0=vref*(1/2+1/2^3+1/2^4+1/2^5+1/2^6+1/2^8);
+disp('Output voltage at '+string(z(2))+' = '+string(v0)+' volt');
+
+
+