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index.js
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function calculate(){
var input1=document.getElementById("input1");
var input2=document.getElementById("input2");
var input3=document.getElementById("input3");
var input4=document.getElementById("input4");
var anslab=document.getElementById("answerlabel")
var ans=document.getElementById("answer");
var in1=input1.value;
var in2=input2.value;
var in3=Number(input3.value);
var in4=Number(input4.value);
if(in1=="P" && in2=="P"|| in1=="F" && in2=="F" || in1=="A" && in2=="A" ){
alert("Change The Parameter")
}
else if(in3==0 || in4==0){
alert("Enter the Value")
}
else {
if(in1=="P" && in2=="F"){
anslab.innerHTML="A (m^2)"
ans.value=Number(in4/in3).toFixed(2)
}
else if(in1=="F" && in2=="P"){
anslab.innerHTML="A (m^2)"
ans.value=Number(in3/in4).toFixed(2)
}
else if(in1=="P" && in2=="A"){
anslab.innerHTML="F (N)"
ans.value=Number(in3*in4).toFixed(2)
}
else if(in1=="A" && in2=="P"){
anslab.innerHTML="F (N)"
ans.value=Number(in3*in4).toFixed(2)
}
else if(in1=="F" && in2=="A"){
anslab.innerHTML="P (N/m^2)"
ans.value=Number(in3/in4).toFixed(2)
}
else if(in1=="A" && in2=="F"){
anslab.innerHTML="P (N/m^2)"
ans.value=Number(in4/in3).toFixed(2)
}
}
}