C语言 -- 定时关机程序

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<strong><span style="font-size:14px;">C语言  --   定时关机程序</span></strong>

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<strong><span style="font-size:14px;">特别注意：</span></strong>

<strong><span style="font-size:14px;"> 1.从接收到的char * 类型转换为 int ，一定不能使用(int)这种方式来转换，要用atoi()</span></strong>

<strong><span style="font-size:14px;">   使用方式：原型: int atoi(const char *nptr);</span></strong>

<strong><span style="font-size:14px;">2. 多个字符串合并，使用sprintf()</span></strong>

<strong><span style="font-size:14px;">   使用方式：sprintf(char *buffer,const char * format[,argument,...])</span></strong>

<strong><span style="font-size:14px;">   以下有使用方式</span></strong>

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#include <stdio.h>#include <string.h>#include <stdlib.h>#include <ctype.h>#include <time.h>  int isNumber(char *a);void getCurrentDate(int seconds);  int main(){printf("欢迎进入定时关机系统！\n");getCurrentDate(0);char str[2]; char flag = 1;while(flag){printf("输入A定时关机，输入C取消定时关机\n"); gets(str);if(strcmp(str,"a")==0) { printf("请输入时间的秒数：\n");char seconds[10];while(1){ gets(seconds);   if(isNumber((char*)seconds))break;else{printf("输入的秒数不正确，请重新给输入！\n");continue;}}  int temp_seconds = atoi(seconds);getCurrentDate(temp_seconds);char shutdown[50] = "shutdown -s -t ";strcat(shutdown,seconds);system(shutdown);system("pause");break;} else if(strcmp(str,"C")==0 || strcmp(str,"c")==0) {system("shutdown -a");printf("已经取消定时关机\n");system("pause");break;}else{printf("输入的值不正确，请重新输入!\n"); flag=1;}}return 0;}//判断字符串是否是数字int isNumber(char *a){char flag=1;int len = strlen(a);for(int i=0;i<len;i++){if(isdigit(a[i])==0){flag = 0;break;}}if(flag) return 1;elsereturn 0;}  //获取系统当前时间void getCurrentDate(int seconds){time_t rawtime;struct tm *timeinfo,*timeinfo2;time(&rawtime); if(seconds > 0){rawtime += seconds; }timeinfo = localtime(&rawtime); int year = timeinfo->tm_year + 1900; int month = timeinfo->tm_mon+1; int day = timeinfo->tm_mday; int hour = timeinfo->tm_hour; int min = timeinfo->tm_min; int secs = timeinfo->tm_sec;  char *str = (char*)malloc(sizeof(char)*100);  memset(str,0,100);//多个值合并字符串if(seconds > 0){sprintf(str,"在%d年%d月%d日 %d时%d分%d秒后关机...",year,month,day,hour,min,secs); }else{sprintf(str,"现在时间是：%d年%d月%d日 %d时%d分%d秒 ",year,month,day,hour,min,secs);  } puts(str);free(str);}

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