之前发过一个关于错误的问题。感谢这里的一些人，我能够解决这个问题。现在，当你输入本金，复利（年度，月度等），利率（0.03等等），以及年数。 其他Q链接：final = P * (((1 + (r/n)) ** (n*t))) TypeError: unsupported operand type(s) for /: 'str' and 'int' 所以从前面的代码我删除了p = 10000，n = 12，r = 0.08，因为当你输入不同的数字时它会给出一个很大的数字。我希望它会用输入的数字来计算它，但它没有。
# User must input principal, Compound rate, annual rate, and years.
P = int(input("Enter starting principle please. "))
n = int(input("Enter Compound intrest rate.(daily, monthly, quarterly, half-year, yearly) "))
r = float(input("Enter annual interest amount. (decimal) "))
t = int(input("Enter the amount of years. "))
final = P * (((1 + (r/n)) ** (n*t)))
#displays the final amount after number of years.
print ("The final amount after", t, "years is", final)
# At the moment it is displaying a very random number.
Enter starting principle please. 1000
Enter Compound intrest rate.(daily, monthly, quarterly, half-year, yearly) 1
Enter annual interest amount. (decimal) 0.01
Enter the amount of years. 1
The final amount after 1 years is 1010.0
最终金额应为1000.10。不确定发生了什么。试图看看是否有办法使P，n，r等于用户输入的数字，这将导致正确的最终答案。
提前致谢。
答案 0 :(得分：1)
如果您对百分比感兴趣，则应在代码中注意这一点。
final = P * (((1 + (r/(100.0 * n))) ** (n*t)))
答案 1 :(得分：1)
请尝试以下Python代码获取复利：
import React from 'react';
import { ScrollView, View, Text, FlatList, TouchableOpacity, Modal, Alert, StyleSheet, ActivityIndicator, Button, ToastAndroid, TouchableHighlight, UIManager, findNodeHandle } from 'react-native';
import {NEWS_SOURCES, fetch_newsByCountry, fetch_newsBySourceID, fetch_newsFullStory} from '../libraries/loader';
export const Toast=(props)=> {
if (props.visible) {
ToastAndroid.showWithGravityAndOffset(props.message, ToastAndroid.LONG, ToastAndroid.BOTTOM, 25, 50);
return null;
}
return null;
};
export default class HeadlinesScreen extends React.Component {
static navigationOptions= {
title: 'Headlines',
};
constructor(props){
super(props);
this.state = { channelSource: this.props.navigation.getParam('channel_data', 'none'), // default value 'none'
dataList: [], modalVisible: false, selectedItemId: null, selectedItem_desc: null };
this._renderItem = this._renderItem.bind(this);
this._handleItemClick = this._handleItemClick.bind(this);
this._displayItemDetails = this._displayItemDetails.bind(this);
this._setModalVisible = this._setModalVisible.bind(this);
this._onFetchComplete = this._onFetchComplete.bind(this);
this._forceTriggerSpeak = this._forceTriggerSpeak.bind(this);
}
render() {
console.log('\n\this.props.navigation:', this.props.navigation);
console.log('\n\nSelected Channel state.params Data: ', this.props.navigation.state.params);
console.log('\n\nSelected Channel param Data: ', this.props.navigation.getParam('channel_data'));
console.log('\n\nSelected Channel state Data: ', this.state.channelSource);
//return (<View></View>) ;
//console.log('\n\nRender: \n',this.state);
console.log('\n\nRender - modal state: \n',this.state.modalVisible);
return (
<ScrollView style={styles.container} accessibilityLiveRegion="polite" importantForAccessibility={this.state.modalVisible==false ? 'yes' : 'no-hide-descendants'}>
{(this.state.dataList.length ==0? <ActivityIndicator size="large" Accessible={true} accessibilityLabel="Loading news, please wait." /> :
this.state.dataList.map(this._renderItem)
)}
<Toast visible={this.state.dataList.length ==0 && this.state.modalVisible==false ? true: false} message="Loading news, please wait." />
<Toast visible={this.state.dataList.length > 0 && this.state.modalVisible==false ? true: false} message={this.state.dataList.length+' news loaded. Tap to read headline. And double tap to read details.'} />
<Toast visible={this.state.dataList.length > 0 && this.state.modalVisible==true ? true: false} message={'Loading full story, please wait.'} />
<Toast visible={this.state.dataList.length > 0 && this.state.modalVisible==true && this.state.selectedItem_desc != null? true: false} message={'Story loaded, please tap on screen to read. And scroll bottom of screen and hit Close button, to close this story.'} />
{(this.state.modalVisible ? this._displayItemDetails() : null)}
</ScrollView>
);
}
async componentDidMount(){
console.log("\n\n\n", this.props.navigation.getParam('channel_data'));
var newsList = await fetch_newsBySourceID(this.state.channelSource, this._onFetchComplete); // external api call
}
_onFetchComplete(payload, payloadType){ // payloadType: list | story
console.log('\n\n onFetchComplete list: \n', payload);
if(Array.isArray(payload) && payloadType == 'list'){
console.log('\n\n onFetchComplete list: \n'+payload.length);
this.setState(previousState => {
return { dataList: payload};
});
}
else{
this.setState(previousState => {
return { selectedItem_desc: payload};
});
}
}
_renderItem(obj, index){
return (
<View key={index} style={{ borderBottomWidth: 1, borderBottomColor: '#ccc', borderStyle: 'solid', padding:10}} >
<TouchableOpacity style={{flexDirection: 'row', }} onPress={()=>this._handleItemClick(index)} accessible={true} accessibilityLiveRegion="polite" accessibilityLabel={(index-1+2)+". "+obj.title} accessibilityHint="Double tap to read full news on next screen.">
<Text style={[styles.lightTxt, styles.rowTxt]} >{obj.title}</Text>
</TouchableOpacity>
</View>
);
}
async _handleItemClick(itemIndex){
console.log('showModal for item: '+itemIndex);
fetch_newsFullStory(this.state.dataList[itemIndex].story_url, this.state.channelSource, this._onFetchComplete);
}
_forceTriggerSpeak(){
UIManager.sendAccessibilityEvent( findNodeHandle(this), UIManager.AccessibilityEventTypes.typeViewClicked);
}
// usually item details in a Popup Modal View
_displayItemDetails(){ // this.state.dataList[this.state.selectedItemId].content
console.log('\n\nDisplay Modal:\n', this.state.modalVisible);
}
// usually used to hide Popup Modal
}
const styles = StyleSheet.create({
container: {
flex: 1,
paddingTop: 15,
backgroundColor: '#000',
},
lightTxt: {
color: '#fff'
},
rowTxt:{
padding:25
},
});
答案 2 :(得分：0)
基于此： 复利公式 FV = P（1 + r / n）^ Yn， 其中P是初始本金，r是年利率，Y是投资年数，n是每年的复利期数。 FV是终值，表示本金在Y年后增长到的金额。
P = int(input("Enter starting principle please. "))
n = int(input("Enter number of compounding periods per year. "))
r = float(input("Enter annual interest rate. e.g. 15 for 15% "))
y = int(input("Enter the amount of years. "))
FV = P * (((1 + ((r/100.0)/n)) ** (n*y)))
print ("The final amount after", y, "years is", FV)
答案 3 :(得分：0)
P = int(input("Enter starting principle please: "))
n = int(input("Enter number of compounding periods per year: "))
r = float(input("Enter annual interest rate: "))
y = int(input("Enter the amount of years: "))
FV = P * (((1 + ((r/100.0)/n)) ** (n*y)))
print ("The final amount after", y, "years is", FV)
答案 4 :(得分：0)
# name
NAME=raw_input("Enter Name= ")
# Principle amount
P =float(input("Enter Principle Amount: "))
# Rate of interest
R = float(input("Enter rate of Interest: "))
#No Of years
T = float(input("Enter No of Years= "))
#compound interest calculation
CI = P * ( 1 + R / 100)**T
print"compound interest is {:.2f}".format(CI)
答案 5 :(得分：0)
每年计算复利的公式是
A = P（1 + R / 100）t
复利= A – P
在哪里， A是金额， P是本金， R是比率， T是时间跨度
def compound_interest(principal, rate, time):
Amount = principal * (pow((1 + rate / 100), time))
CI = Amount - principal
print("Compound interest is", CI)
compound_interest(100000000, 14, 8)