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calculator works #78

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47c4ac0
calculator works
caglenoah Jun 24, 2023
4c27358
added title
caglenoah Jun 24, 2023
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19 changes: 8 additions & 11 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -4,29 +4,26 @@
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<!-- <script src="main.js"></script> -->
<title>Document</title>
<script src="main.js"></script>
<title>Calculator-app-101</title>
</head>
<body>
<form class="calculator">
<label for="first-number">First Number:</label>
<!-- the "onkeyup" event listener passes its input's "value" to the "saveFirstNumber" function in the main.js file -->
<input type="number" id="first-Number" name="first-Number" placeholder="type the first number" value="" onkeyup="saveFirstNumber(this.value)">
<input type="number" id="first-Number" name="first-Number" placeholder="Type the first number" value="" onkeyup="saveFirstNumber(this.value)">
<label for="second-number">Second Number:</label>
<input type="number" id="second-Number" name="second-Number" placeholder="type the second number" onkeyup="saveSecondNumber(this.value)">
<input type="number" id="second-Number" name="second-Number" placeholder="Type the second number" onkeyup="saveSecondNumber(this.value)">
<div>
<!-- the "onclick" event listener passes its element's "id" to the "changeOperation" function in the main.js file -->
<button type="button" name="add" id="addition" onclick="changeOperation(this.id)">Add</button>
<button type="button" name="subtract" id="subtraction" onclick="changeOperation(this.id)">Subtract</button>
<button type="button" name="multiply" id="multiplication">Multiply</button>
<button type="button" name="divide" id="division">Divide</button>
<button type="button" name="modulus" id="modulus">Modulus</button>
<button type="button" name="multiply" id="multiplication" onclick="changeOperation(this.id)">Multiply</button>
<button type="button" name="divide" id="division" onclick="changeOperation(this.id)">Divide</button>
<button type="button" name="modulus" id="modulus" onclick="changeOperation(this.id)">Modulus</button>
</div>
<br>
<!-- this "onclick" calls the "equal" function in the main.js file -->
<button type="button" onclick="equals()">Equals</button>
<button type="reset">Clear</button>
</form>
<div id="result"></div>
</body>
</html>
</html>
115 changes: 59 additions & 56 deletions main.js
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@@ -1,76 +1,79 @@
// These variable hold the numbers we want to do operations on and the name of the operation we want to perform.
// They are expected to change so we use the "let" keyword.
let firstNum = null
let secondNum = null
let operation = null
// These variables hold the numbers we want to perform operations on and the name of the operation we want to perform.
// They are expected to change, so we use the "let" keyword.
let firstNum = null;
let secondNum = null;
let operation = null;

// this function takes in the number you type in the input field and saves it to the "firstNum" variable
// This function takes in the number you type in the input field and saves it to the "firstNum" variable
const saveFirstNumber = (num) => {
firstNum = parseInt(num)
}
firstNum = parseInt(num);
};

// this function takes in the number you type in the 2nd input field and saves it to the "secondNum" variable
// This function takes in the number you type in the 2nd input field and saves it to the "secondNum" variable
const saveSecondNumber = (num) => {
// "parseInt" is a built in function in JS that converts a string/word into a number
secondNum = parseInt(num)
}
secondNum = parseInt(num);
};

// this function takes in two argument/numbers and returns the sum of them
// This function takes in two arguments/numbers and returns the sum of them
const add = (numA, numB) => {
const sum = numA + numB
return sum
}
const sum = numA + numB;
return sum;
};

// this function takes in two argument/numbers and returns the difference of them
// This function takes in two arguments/numbers and returns the difference of them
const subtract = (numA, numB) => {
const difference = numA - numB
return difference
}

// These variables are already defined but that don't point to functions. It's up to you to build the functions to complete your calculator use:
const difference = numA - numB;
return difference;
};

// This function takes in two arguments/numbers and returns their product
const multiply = (numA, numB) => {
// * to get a product then return it
// Open up the inspector tool in Chrome and select the Console tab to see what this functions is "logging out" to the console.
console.log(numA, numB)
}
const product = numA * numB;
return product;
};

const divide = null
// / to get a quotient,
// This function takes in two arguments/numbers and returns the quotient
const divide = (numA, numB) => {
const quotient = numA / numB;
return quotient;
};

const modulus = null
// and % to get a remainder.
// This function takes in two arguments/numbers and returns the remainder
const modulus = (numA, numB) => {
const remainder = numA % numB;
return remainder;
};

// This function changes the "operation" variable to be equal to the "id" of the button we choose on the web page.
// This function changes the "operation" variable to be equal to the "id" of the button we choose on the web page
const changeOperation = (chosenOperation) => {
operation = chosenOperation
// Use your Chrome Inspector Tool > Console Tab to see the "operation" that's logged
console.log(operation)
}
operation = chosenOperation;
};

// In order to show the user their results we have to access the DOM and stick in the value
// In order to show the user their results, we have to access the DOM and insert the value
const putResultInElement = (operationResults) => {
// access the DOM by writing "document" then use the method "getElementById" and pass it the id, "result".
document.getElementById("result").innerHTML = "Results: " + operationResults

// Remember, each element has built in properties like "innerHTML" which we can change to anything we like.
// Here we give it a string: "Results: " and add the value of the operation to it.
}
document.getElementById("result").innerHTML = "Results: " + operationResults;
};

// The function uses the value of "operation" variable to determine which operation function it should use on the number: add, subtract, multiply, divide, or modulus
// The function uses the value of the "operation" variable to determine which operation function it should use on the numbers: add, subtract, multiply, divide, or modulus
const equals = () => {
switch (operation) {
case "addition": putResultInElement(add(firstNum, secondNum))
break;
case "subtraction": putResultInElement(subtract(firstNum, secondNum))
break;
case "multiplication": multiply(firstNum, secondNum)
break;
case "division": console.log(divide(firstNum, secondNum))
break;
case "modulus": console.log(modulus(firstNum, secondNum))
break;
default: "Choose an operation"
case "addition":
putResultInElement(add(firstNum, secondNum));
break;
case "subtraction":
putResultInElement(subtract(firstNum, secondNum));
break;
case "multiplication":
putResultInElement(multiply(firstNum, secondNum));
break;
case "division":
putResultInElement(divide(firstNum, secondNum));
break;
case "modulus":
putResultInElement(modulus(firstNum, secondNum));
break;
default:
putResultInElement("Choose an operation");
break;
}
}

};
44 changes: 39 additions & 5 deletions style.css
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@@ -1,5 +1,39 @@
body {
margin: 20% auto;
width: 50%;
height: 75%;
}
.calculator {
display: grid;
grid-template-columns: repeat(4, 1fr);
grid-gap: 5px;
max-width: 300px;
margin: 0 auto;
padding: 10px;
background-color: #f4f4f4;
border-radius: 5px;
}

.calculator input[type="number"],
.calculator button {
grid-column: span 2;
padding: 10px;
font-size: 16px;
}

.calculator input[type="number"] {
grid-column: span 4;
}

.calculator button {
cursor: pointer;
background-color: #d4d4d4;
border: none;
border-radius: 3px;
}

.calculator button:hover {
background-color: #b4b4b4;
}

.calculator #result {
grid-column: span 4;
margin-top: 10px;
font-size: 18px;
text-align: right;
}