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App.js
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App.js
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import React, {Component} from 'react';
import { StyleSheet, View, Text, TextInput, Button } from 'react-native';
import Header from './src/components/header';
export default class App extends Component{
constructor(props){
super(props);
this.state={
input1: '',
input2:'',
result:''
}
this.sum = this.sum.bind(this);
this.deduct = this.deduct.bind(this);
this.div = this.div.bind(this);
this.mult = this.mult.bind(this);
}
sum (){
const number1= parseFloat(this.state.input1);
const number2= parseFloat(this.state.input2);
const result=number1 + number2;
this.setState({
result:result
})
}
deduct (){
const number1= parseFloat(this.state.input1);
const number2= parseFloat(this.state.input2);
const result=number1 - number2;
this.setState({
result:result
})
}
div (){
const number1= parseFloat(this.state.input1);
const number2= parseFloat(this.state.input2);
const result=number1 / number2;
this.setState({
result:result
})
}
mult (){
const number1= parseFloat(this.state.input1);
const number2= parseFloat(this.state.input2);
const result=number1 * number2;
this.setState({
result:result
})
}
render() {
return(
<View style={styles.container}>
<Header headerText='Simple Calculator'/>
<View style={styles.buttonWrapper}>
<Button onPress={this.sum}
color='#000000'
tit
title='+'
/>
<Button onPress={this.mult}
color='#000000'
title='*'
/>
<Button onPress={this.div}
color='#000000'
title='/'
/>
<Button onPress={this.deduct}
color='#000000'
title='-'
/>
</View>
<View style={styles.contentWrapper}>
<TextInput style={styles.input}
placeholder='First Number'
onChangeText={(text) => {
this.setState({
input1:text
})
}}
value={this.state.input1}
/>
<TextInput style={styles.input}
placeholder='Second Number'
onChangeText={(text) => {
this.setState({
input2:text
})
}}
value={this.state.input2}
/>
<Text style={styles.simpleText}> Result: {this.state.result}</Text>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
container:{
flex:1,
flexDirection:'column'
},
buttonWrapper:{
flexDirection:'row',
justifyContent:'space-around',
},
contentWrapper:{
padding:20,
flexDirection:'column',
justifyContent:'center'
},
input:{
height:45,
fontSize:20
},
simpleText:{
height:45,
fontSize:30
}
});