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HTML

              
                <div id="root">
    <!-- This element's contents will be replaced with your component. -->
</div>
              
            
!

CSS

              
                @import 'https://fonts.googleapis.com/css?family=Share+Tech+Mono';
@font-face {
    font-family: "Digital";
    src: url("//db.onlinewebfonts.com/t/8e22783d707ad140bffe18b2a3812529.eot");
    src: url("//db.onlinewebfonts.com/t/8e22783d707ad140bffe18b2a3812529.eot?#iefix") format("embedded-opentype"), url("//db.onlinewebfonts.com/t/8e22783d707ad140bffe18b2a3812529.woff2") format("woff2"), url("//db.onlinewebfonts.com/t/8e22783d707ad140bffe18b2a3812529.woff") format("woff"), url("//db.onlinewebfonts.com/t/8e22783d707ad140bffe18b2a3812529.ttf") format("truetype"), url("//db.onlinewebfonts.com/t/8e22783d707ad140bffe18b2a3812529.svg#Digital-7") format("svg");
  }
*{
    padding:0;
    margin: 0;
    box-sizing: border-box;
}


#root {
    display: flex;
    height: 100vh;
}

#calculator-body{
    margin: auto;
    border-radius: 10px;
    background-color: gray;
    width: 240px;
    text-align: center;
    font-family: digital;
    padding: 10px;
}

#calcOutput{
    background-color: white;
    height: 70px;
    font-size: 50px;
    text-align: end;
    overflow: hidden;
    border-radius: 5px;
    padding: 5px;
}

#calculator {
    margin-top: 10px;

}

#calculator .btn {
    margin: 5px;
    width: 35px;
    height: 35px;
}

#calculator .btn-wide {
    width: 170px;
}
              
            
!

JS

              
                class Calculator extends React.Component { 
    constructor(props){
        super(props)
// if flag is true it means that one decimals are loaded or an operator, this is a good solution for the user story, 
// only the last operator is counted and only one decimals in the number
        this.state = {
            currentNumber: "0",
            operatorFlag: false,
            decimalFlag: false
        }

        this.handleClick = this.handleClick.bind(this);
    }
        handleClick(buttonName) {
        let currentNumber = this.state.currentNumber;
        let operatorFlag = this.state.operatorFlag;
        let decimalFlag = this.state.decimalFlag;
        //swithc is true until break
        switch(true){
        //in the cases of 0123456789 go through the loop, condition is current number is not a 0
          case  buttonName === "0" ||
                buttonName === "1" ||
                buttonName === "2" ||
                buttonName === "3" ||
                buttonName === "4" ||
                buttonName === "5" ||
                buttonName === "6" ||
                buttonName === "7" ||
                buttonName === "8" ||
                buttonName === "9" :
                if(this.state.currentNumber != "0"){
                //if condition is true add clicked case to current number
                    currentNumber += buttonName;
                    //switch operator flag to false to enable re-insertion of operator + - / *
                    operatorFlag = false;
                } else {
                //if the current number is 0 then override zero with pressed case
                    currentNumber = buttonName;
                }
                    break;
                  //in the case of + - / * check condition of operator flag if true 
                    case buttonName === "+" ||
                         buttonName === "-" ||
                         buttonName === "/" ||
                         buttonName === "*" :
                         if(!this.state.operatorFlag){
                           //add operator to number
                             currentNumber += buttonName;
                              //switch operator flag to true to disable re-insertion of operator + - / *
                             operatorFlag = true;
                             decimalFlag= false;
                          //if contidion false
                         }else{
                          //remove last entry from current number and add new entry 
                             const newNumber = currentNumber.slice(0,currentNumber.length-1);
                             currentNumber = newNumber + buttonName;
                         }
                        break;
                        case buttonName === "C":
                        currentNumber = "0";
                        operatorFlag = false;
                        decimalFlag= false;
                        break;
                        case buttonName === "=":
                        currentNumber = eval(currentNumber);
                        operatorFlag = false;
                        decimalFlag= true;
                        break;
                        case buttonName === ".":
                        if(!this.state.decimalFlag){
                            currentNumber += buttonName;
                            decimalFlag = true;
                        }
                } 
                this.setState({decimalFlag: decimalFlag});        
                this.setState({currentNumber:currentNumber});
                this.setState({operatorFlag: operatorFlag});
        }



    render() { 
        return (
            <div id = "calculator-body">
                <div id="calcOutput" >
                    <Screen currentNumber = {this.state.currentNumber}/>
                </div>
                <div id = "calculator">
                    <Button id = "clear" name = "C" handleClick = {this.handleClick} className = {"btn btn-danger"}/>
                    <Button id = "multiply" name = "*" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "divide" name = "/" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "add" name = "+" handleClick = {this.handleClick} className = {"btn btn-info"}/>

                    <Button id = "seven" name = "7" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "eight" name = "8" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "nine" name = "9" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "subtract" name = "-" handleClick = {this.handleClick} className = {"btn btn-info"}/>

                    <Button id = "four" name = "4" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "five" name = "5" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "six" name = "6" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "decimal" name = "." handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "one" name = "1" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "two" name = "2" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                    <Button id = "three" name = "3" handleClick = {this.handleClick} className = {"btn btn-info"}/>
                      
                    
                    <Button id = "equals" name = "=" handleClick = {this.handleClick} className = {"btn btn-info btn-high"}/>
                    <Button id = "zero" name = "0" handleClick = {this.handleClick} className = {"btn btn-info btn-wide"}/>
                    
            </div>
                
            </div>
            

        ); 
    } 
} 

class Screen extends React.Component {
    render(){
        return(
            <div id = "display">
                {this.props.currentNumber}
            </div>
        )
    }
}

class Button extends React.Component {
    runParentHandleClick = () => {
        this.props.handleClick(this.props.name)
    }
    render(){
        return(
            <button id = {this.props.id} onClick = {this.runParentHandleClick} className = {this.props.className}>{this.props.name}</button>
        )
    }
}
ReactDOM.render(<Calculator />, document.getElementById('root'));
              
            
!
999px

Console