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Logic.js
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Logic.js
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let digits = document.querySelectorAll(".btn-default");
let result = document.querySelector("#result");
let input = document.querySelector(".form-control");
let digitsAfterOperator = "";
let isPrint = false;
// Digits
const clickDigits = () => {
for (let item of digits) {
item.addEventListener("click", (e) => {
if (isPrint) {
result.value = "";
digitsAfterOperator = "";
input.dataset.current = "";
}
if (result.value == "" && e.target.value == ".") {
isPrint = false;
result.value += "0.";
digitsAfterOperator += result.value;
return;
}
result.value += e.target.value;
digitsAfterOperator += e.target.value;
isPrint = false;
});
}
};
clickDigits();
// Operators
const clickOperators = () => {
let operation = document.querySelectorAll(".btn-primary");
for (let item of operation) {
item.addEventListener("click", (e) => {
if (result.value != "") {
result.value += e.target.value;
input.dataset.operation = e.target.value;
input.dataset.current = digitsAfterOperator;
digitsAfterOperator = "";
}
})
}
};
clickOperators();
// Calculate
const calculate = () => {
switch (input.dataset.operation) {
case "+":
result.value =
parseFloat(input.dataset.current) + parseFloat(digitsAfterOperator);
break;
case "-":
result.value =
parseFloat(input.dataset.current) - parseFloat(digitsAfterOperator);
break;
case "x":
result.value =
parseFloat(input.dataset.current) * parseFloat(digitsAfterOperator);
break;
case "/":
if (input.dataset.current != "0" && digitsAfterOperator == "0") {
result.value = "Cannot divide by zero";
} else {
if (input.dataset.current == "0" && digitsAfterOperator == "0") {
result.value = "Result is undefined";
} else {
result.value =
parseFloat(input.dataset.current) / parseFloat(digitsAfterOperator);
}
}
// if (result.value.length > 20) {
// let fixedValue = parseFloat(result.value).toFixed(15);
// result.value = fixedValue;
// }
break;
default:
break;
}
};
// Print
let isClickOnModul = false;
const print = () => {
document.querySelector(".btn-danger").addEventListener("click", () => {
if (isClickOnModul) {
let value = parseFloat(result.value) % parseFloat(digitsAfterOperator);
result.value = value;
isClickOnModul = false;
return;
}
calculate();
isPrint = true;
})
};
print();
// Clear all
const clear = () => {
document.querySelector(".btn-clear").addEventListener("click", () => {
result.value = "";
input.dataset.current = "";
digitsAfterOperator = "";
})
};
clear();
// Remove last symbol
const back = () => {
document.querySelector(".btn-back").addEventListener("click", () => {
let copyStr = "";
for (let i = 0; i < result.value.length - 1; i++) {
copyStr += result.value[i];
}
result.value = copyStr;
digitsAfterOperator = copyStr;
})
};
back();
// Procent
const procent = () => {
document.querySelector(".btn-procent").addEventListener("click", () => {
let value = parseFloat(result.value) / 100;
result.value = value;
digitsAfterOperator = result.value;
})
};
procent();
// Pow
const pow = () => {
document.querySelector(".btn-pow").addEventListener("click", () => {
let value = parseFloat(result.value);
result.value = Math.pow(value, 2);
digitsAfterOperator = result.value;
})
};
pow();
// Plus/Minus
const plusMinus = () => {
let value = "";
document.querySelector(".btn-plusMinus").addEventListener("click", () => {
if (result.value != "") {
if (!result.value.includes("-")) {
value = result.value;
result.value = `-${value}`;
digitsAfterOperator = result.value;
} else {
result.value = value;
digitsAfterOperator = result.value;
}
}
})
};
plusMinus();
// Modul
const modul = () => {
document.querySelector(".btn-modul").addEventListener("click", () => {
result.value += " Mod ";
digitsAfterOperator = "";
isClickOnModul = true;
})
};
modul();
// Square
const square = () => {
document.querySelector(".btn-square").addEventListener("click", () => {
let value = parseFloat(result.value);
result.value = Math.sqrt(value).toFixed(15);
digitsAfterOperator = result.value;
})
};
square();
// PI
const pi = () => {
document.querySelector(".btn-pi").addEventListener("click", () => {
result.value = Math.PI.toFixed(15);
digitsAfterOperator = result.value;
})
};
pi();