Syntax differences between C++, Java and Python-C++-php.cn

Syntax differences between C++, Java and Python

WBOY

Release： 2024-06-03 16:17:00

Original

738 people have browsed it

Syntax differences between C++, Java and Python

Introduction

C++, Java and Python are three popular programming languages, but their syntax differs significantly. Understanding these differences is critical for multilingual development and project collaboration.

Basic Syntax

Features	C++	Java	Python
Semicolon	Required	Optional	Not required
Cure braces	for blocks and classes	for blocks, methods and classes	for indentation
Case sensitive	Yes	Yes	No

Data type

##Type systemstaticstaticdynamicType declarationUse Keywords (int, double, etc.)Use keywords (int, String, etc.)Use variable assignment typeType conversionRequires type conversion operator (such as (int))Automatic conversionCoercion depends on context

Features	C++	Java	Python

Control flow

##Featuresif statementif (condition)if (condition)if condition:##while loopUse for loopUse Function

C++	Java	Python
Use	Use	Use
while (condition)	`Use` while (condition)	`Use` while condition:
for (initialization; condition; increment/decrement)	`Use` for (initialization; condition; increment/decrement)	`Use` for variable in Sequence:

##FeatureC++ Function declarationUse return type, function name and parameter listdefUse function name and parameters##Practical case

Java	Python
Use return type, function name and parameter list	Use	keyword and function name	Function call
Use function name and parameters	Use function name and parameters

Consider the following simple program that calculates pi:

// Java
import java.math.BigDecimal;
import java.math.MathContext;

public class PiCalculator {
    public static void main(String[] args) {
        BigDecimal pi = BigDecimal.ZERO;
        int numIterations = 1000_000;
        for (int i = 0; i < numIterations; i++) {
            pi = pi.add(new BigDecimal(4).divide(new BigDecimal(2 * i + 1), MathContext.DECIMAL64));
        }
        System.out.println(pi);
    }
}

Copy after login

# Python
import decimal

def calculate_pi(num_iterations):
    pi = decimal.Decimal(0)
    for i in range(num_iterations):
        pi += decimal.Decimal(4) / decimal.Decimal(2 * i + 1)
    return pi

print(calculate_pi(1_000_000))

Copy after login

Conclusion

Although C++, Java, and Python are all powerful programming languages, their syntax differs Affects the structure, style and readability of the code. Understanding these differences is critical for cross-language development, code reuse, and team collaboration.

The above is the detailed content of Syntax differences between C++, Java and Python. For more information, please follow other related articles on the PHP Chinese website!