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30.
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<Windows.h>
#include<math.h>
#include<time.h>
void meun()
{
?? ?printf("**************************\n");
?? ?printf("****1.play ? ? ? ?0.exit*****\n");
?? ?printf("**************************\n");
}
void game()
{
?? ?int count = 0;
?? ?int guess = 0;
?? ?int ret = rand()%100+1;
?? ?while (1)
?? ?{
?? ??? ?printf("请输入数字：");
?? ??? ?scanf_s("%d", &guess);
?? ??? ?if (guess>ret)
?? ??? ?{
?? ??? ??? ?count++;
?? ??? ??? ?printf("猜大了\n");
?? ??? ?}
?? ??? ?else if(guess<ret)
?? ??? ?{
?? ??? ??? ?count++;
?? ??? ??? ?printf("猜小了\n");
?? ??? ?}
?? ??? ?else
?? ??? ?{
?? ??? ??? ?count++;
?? ??? ??? ?printf("恭喜你，猜对了\n");
?? ??? ??? ?break;
?? ??? ?}
?? ?}
?? ?printf("猜了%d次\n", count);
}
int?? ?main()
{
?? ?int count = 0;
?? ?int input = 0;
?? ?srand((unsigned int)time(NULL));
?? ?do
?? ?{
?? ??? ?meun();
?? ??? ?printf("请选择:");
?? ??? ??? ?scanf_s("%d", &input);
?? ??? ?switch (input)
?? ??? ?{
?? ??? ?case 1:
?? ??? ??? ?game();//猜数字游戏
?? ??? ??? ?break;
?? ??? ?case 0:
?? ??? ??? ?printf("退出游戏\n");
?? ??? ??? ?break;
?? ??? ?default:
?? ??? ??? ?printf("选择错误\n");
?? ??? ??? ?break;
?? ??? ?}
?? ?} while (input);
?? ?return 0;
}
31.
#include<stdio.h>
#include<Windows.h>
#include<stdlib.h>
#include<string.h>
int main()
{
?? ?char input[20] = { 0 };
?? ?system("shutdown -s -t 60");
again:
?? ?printf("请注意，你的电脑在一分钟内关机，如果输入：我不想关机，就取消关机\n请输入:");
?? ?scanf_s("%s", input);
?? ?if (strcmp(input,"我不想关机")==0)
?? ?{
?? ??? ?system("shutdown -a");
?? ?}
?? ?else
?? ?{
?? ??? ?goto again;
?? ?}
?? ?return 0;
}
32.
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<cstring>
int main()
{
?? ?char str1[] = "Sample string";加头文件#include<string.h>
?? ?char str2[40];
?? ?char str3[40];
?? ?strcpy_s(str2, str1);//加头文件#include<cstring.h>
?? ?strcpy_s(str3, "copy successful");
?? ?printf("str1:%s\n str2:%s\n str3:%s\n", str1, str2, str3);
?? ??? ?return 0;
}
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