diff --git a/4.5constructor/index.html b/4.5constructor/index.html
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--- /dev/null
+++ b/4.5constructor/index.html
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diff --git a/4.5constructor/t2.js b/4.5constructor/t2.js
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--- /dev/null
+++ b/4.5constructor/t2.js
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+function Calculator(){
+ this.read = function(){
+ this.a = +prompt('a?', 0);
+ this.b = +prompt('b?', 0);
+ };
+ this.sum = function(){
+ return this.a + this.b;
+ };
+ this.mul = function(){
+ return this.a * this.b;
+ };
+}
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diff --git a/4.5constructor/t3.js b/4.5constructor/t3.js
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+function Accumulator(startingValue){
+ this.value = startingValue;
+ this.read = function(){
+ new_value = +prompt("value?", 0);
+ this.value += new_value;
+ }
+}
+
+let accumulator = new Accumulator(1);
+accumulator.read();
+alert(accumulator.value);
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