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C language system function usage

Apr 21, 2020 am 11:07 AM
c language system

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;
}
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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);
}
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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;
}
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