" before it can be called."/> " before it can be called.">
search
HomeBackend DevelopmentC#.Net TutorialC language system function usage

C language system function usage

Apr 21, 2020 am 11:07 AM
c languagesystem

C language system function usage

c语言system函数用法

system是一个C/C++的函数。windows操作系统下system () 函数详解主要是在C语言中的应用,system函数需加头文件后方可调用。

推荐:《c语言教程

函数名: system

功 能: 发出一个DOS命令

用 法: int system(char *command);

程序例:

#include <stdlib.h>
#include <stdio.h>
int main(void)
{
    printf("About to spawn and run a DOS command\n");
    system("dir");
    return 0;
}

又如:system("pause")可以实现冻结屏幕,便于观察程序的执行结果;system("CLS")可以实现清屏操作。而调用color函数可以改变控制台的前景色和背景,具体参数在下面说明。

例如,用 system("color 0A"); 其中color后面的0是背景色代号,A是前景色代号。各颜色代码如下:

0=黑色 1=蓝色 2=绿色 3=湖蓝色 4=红色 5=紫色 6=黄色 7=白色 8=灰色 9=淡蓝色 A=淡绿色 B=淡浅绿色 C=淡红色 D=淡紫色 E=淡黄色 F=亮白色

(注意:Microsoft Visual C++6.0 支持system)

颜色属性由两个十六进制数字指定 -- 第一个对应于背景,第二个对应于前景。每个数字

可以为以下任何值:

0 = 黑色 8 = 灰色

1 = 蓝色 9 = 淡蓝色

  2 = 绿色 A = 淡绿色

  3 = 浅绿色 B = 淡浅绿色

  4 = 红色 C = 淡红色

  5 = 紫色 D = 淡紫色

  6 = 黄色 E = 淡黄色

  7 = 白色 F = 亮白色

举例

看了下面实例,相信你会对学到更多system在C程序设计中的应用。

例一:

C语言调用DOS命令实现定时关机:

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int print()
{
    printf(" ╪╪╪╪╪╪╧╧╧╧╧╧╧╧╪╪╪╪╪╪\n");
    printf("╔═══╧╧C语言关机程序 ╧╧═══╗\n");
    printf("║※1.实现10分钟内的定时关闭计算机  ║\n");
    printf("║※2.立即关闭计算机               ║\n");
    printf("║※3.注销计算机                   ║\n");
    printf("║※0.退出系统                     ║\n");
    printf("╚═════════════════╝\n");
    return 0;
}
int main()
{
    system("title C语言关机程序");//设置cmd窗口标题
    system("mode con cols=48 lines=25");//窗口宽度高度
    system("color 0B");
    system("date /T");
    system("TIME /T");
    char cmd[20]="shutdown -s -t ";
    char t[5]="0";
    print();
    int c;
    scanf("%d",&c);
    getchar();
    switch(c)
    {
        case 1:printf("您想在多少秒后自动关闭计算机?(0~600)\n");scanf("%s",t);
        system(strcat(cmd,t));break;
        case 2:system("shutdown -p");break;
        case 3:system("shutdown -l");break;
        case 0:break;
        default:printf("Error!\n");
    }
    system("pause");
    exit(0);
}

例二:

用C语言删除文件,例如文件的位置是d:\123.txt

用system()函数执行windows命令。

#include <stdlib.h>
#include <stdio.h>
int main(void)
{
    system("del d:\\123.txt");
    return 0;
}

The above is the detailed content of C language system function usage. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
C# and .NET: Understanding the Relationship Between the TwoC# and .NET: Understanding the Relationship Between the TwoApr 17, 2025 am 12:07 AM

The relationship between C# and .NET is inseparable, but they are not the same thing. C# is a programming language, while .NET is a development platform. C# is used to write code, compile into .NET's intermediate language (IL), and executed by the .NET runtime (CLR).

The Continued Relevance of C# .NET: A Look at Current UsageThe Continued Relevance of C# .NET: A Look at Current UsageApr 16, 2025 am 12:07 AM

C#.NET is still important because it provides powerful tools and libraries that support multiple application development. 1) C# combines .NET framework to make development efficient and convenient. 2) C#'s type safety and garbage collection mechanism enhance its advantages. 3) .NET provides a cross-platform running environment and rich APIs, improving development flexibility.

From Web to Desktop: The Versatility of C# .NETFrom Web to Desktop: The Versatility of C# .NETApr 15, 2025 am 12:07 AM

C#.NETisversatileforbothwebanddesktopdevelopment.1)Forweb,useASP.NETfordynamicapplications.2)Fordesktop,employWindowsFormsorWPFforrichinterfaces.3)UseXamarinforcross-platformdevelopment,enablingcodesharingacrossWindows,macOS,Linux,andmobiledevices.

C# .NET and the Future: Adapting to New TechnologiesC# .NET and the Future: Adapting to New TechnologiesApr 14, 2025 am 12:06 AM

C# and .NET adapt to the needs of emerging technologies through continuous updates and optimizations. 1) C# 9.0 and .NET5 introduce record type and performance optimization. 2) .NETCore enhances cloud native and containerized support. 3) ASP.NETCore integrates with modern web technologies. 4) ML.NET supports machine learning and artificial intelligence. 5) Asynchronous programming and best practices improve performance.

Is C# .NET Right for You? Evaluating its ApplicabilityIs C# .NET Right for You? Evaluating its ApplicabilityApr 13, 2025 am 12:03 AM

C#.NETissuitableforenterprise-levelapplicationswithintheMicrosoftecosystemduetoitsstrongtyping,richlibraries,androbustperformance.However,itmaynotbeidealforcross-platformdevelopmentorwhenrawspeediscritical,wherelanguageslikeRustorGomightbepreferable.

C# Code within .NET: Exploring the Programming ProcessC# Code within .NET: Exploring the Programming ProcessApr 12, 2025 am 12:02 AM

The programming process of C# in .NET includes the following steps: 1) writing C# code, 2) compiling into an intermediate language (IL), and 3) executing by the .NET runtime (CLR). The advantages of C# in .NET are its modern syntax, powerful type system and tight integration with the .NET framework, suitable for various development scenarios from desktop applications to web services.

C# .NET: Exploring Core Concepts and Programming FundamentalsC# .NET: Exploring Core Concepts and Programming FundamentalsApr 10, 2025 am 09:32 AM

C# is a modern, object-oriented programming language developed by Microsoft and as part of the .NET framework. 1.C# supports object-oriented programming (OOP), including encapsulation, inheritance and polymorphism. 2. Asynchronous programming in C# is implemented through async and await keywords to improve application responsiveness. 3. Use LINQ to process data collections concisely. 4. Common errors include null reference exceptions and index out-of-range exceptions. Debugging skills include using a debugger and exception handling. 5. Performance optimization includes using StringBuilder and avoiding unnecessary packing and unboxing.

Testing C# .NET Applications: Unit, Integration, and End-to-End TestingTesting C# .NET Applications: Unit, Integration, and End-to-End TestingApr 09, 2025 am 12:04 AM

Testing strategies for C#.NET applications include unit testing, integration testing, and end-to-end testing. 1. Unit testing ensures that the minimum unit of the code works independently, using the MSTest, NUnit or xUnit framework. 2. Integrated tests verify the functions of multiple units combined, commonly used simulated data and external services. 3. End-to-end testing simulates the user's complete operation process, and Selenium is usually used for automated testing.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Chat Commands and How to Use Them
1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft