On the application of system function

First you need to call the header file #include<stdlib.h>

1. Set the cmd window title

system("title C语言关机程序");

2. Window width, height

system("mode con cols=48 lines=25");/

3. Set the color

system("color 1D");

The 1 behind the color is the background color code , and D is the foreground color code .

0 = black 8 = gray ("bright black")

1 = blue 9 = bright blue

2 = green A = bright green

3 = lake blue B = bright lake blue

4 = red C = bright red

5 = purple D = bright purple

6 = yellow E = bright yellow

7 = white F = bright white

4. Date

system("date /T");

5. time

system("TIME /T");

6. Timing 60 seconds to shut down

system("shutdown -s -t 60");

7. Cancel shutdown command

system("shutdown -a")；

8. This function means to suspend , waiting for the user signal; otherwise, the console program will pass in a flash, and you will not have time to see the execution result.

system("pause");

9. Use C language to delete the file , for example, the location of the file is d:\123.txt and use the system() function to execute the windows command.

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

Let's take a look at this program, can you understand it? If it can explain that you have learned it, if not, please take a look at the previous explanation

#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("║※4.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);
}

On the application of system function

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