【C】定时关机

#include   
#include   
#include  
 
int print(){ 
	printf(" ╪╪╪╪╪╪╧╧╧╧╧╧╧╧╧╧╪╪╪╪╪╪\n");   
	printf("╔═════╧╧ Obj.C Turn off ╧╧════╗\n"); 
	printf("	※1.Turn off the Computer in 10min\n");   
	printf("	※2.Turn off immediately\n");   
	printf("	※3.Log off the Computer\n");   
	printf("	※0.Exit\n"); 
	printf("╚═════════════════════╝\n"); 
	return 0;   
} 
void main(){ 
	int c; 
	char cmd[20]="shutdown -s -t ";   
	char t[5]="0";   
	system("title Turn off program");				//Set the title of cmd   
	system("mode con cols=48 lines=25");		//Set the height & width of window   
	system("color 0B");   
	system("date /T");   
	system("TIME /T"); 
	print();   
	scanf("%d",&c);   
	getchar();   
	switch(c){ 
		case 1: printf("How long do you expert to turn off the computer?(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);   
}