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P3
int centimetro=0;
double pulga=0.39737,re=0;

centimetro= Integer.parseInt(txtCent.getText());

re=centimetro*pulga;txtRe.setText(""+re);


p4
double pel1=0,pulg=0.39737,re=0;
pel1=Double.parseDouble(txtPulg.getText());
re=pel1/pulg;

txtRe.setText(""+re);P5
int metro=0;
double pie=3.2808,re=0;

metro= Integer.parseInt(txtMetro.getText());

re= metro*pie;txtRe.setText(""+re);


}

P6
int metro=0;
double pie=3.2808,re=0;

metro= Integer.parseInt(txtMetro.getText());

re= metro/pie;txtRe.setText(""+re);


P7
int kg=0;
double libra=2.2046,re=0;

kg=Integer.parseInt(txtKg.getText());

re=kg*libra;txtResultado.setText(""+re);
p8
double kg=0;
double libra=2.2046,re=0;

kg=Double.parseDouble(txtKg.getText());

re=kg/libra;txtResultado.setText(""+re);


p9
int lg=0,area=0,radi=0;


radi= Integer.parseInt(txtRadio.getText());lg=radi*2;
area=radi*radi;

txtArea.setText(""+area+ "pi");
txtLongi.setText(""+lg+"pi");
P10
int radio=0,r=0;radio=Integer.parseInt(txtRa.getText());

r=radio*radio;

txtRt.setText(""+r+"pi");

P11
double dep=0,des=0.2,r=0;
dep=Double.parseDouble(txtDp.getText());
r=dep*des;txtDs.setText(""+r);

P12
double pp=0,pd=0,d=0.1,de=0;
pp=Double.parseDouble(txtPP.getText());
de=pp*d;
pd=pp-de;
txtPD.setText(""+pd);...