折半查找加小游戏

#include<stdio.h>
#include<stdlib.h>
int main(){
    //折半查找,假设为升序
    int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
    int tofind = 5;
    int left = 0;
    int right = sizeof(arr) / sizeof(arr[0]) - 1;
    
    while (left <= right){
        int mid = (left+right) / 2;
        if (tofind < arr[mid]){
            right = mid - 1;
        }
        else if (tofind > arr[mid]){
            left = mid + 1;
        }
        else{
            printf("下标为%d\n", mid);
            break;
        }
    }
    //没有这个数的情况
    if (left > right){
        printf("没找到这个数\n");
    }
    system("pause");
    return 0;
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>

int menu(){
    printf("########################\n");
    printf("####开始游戏请输入1####\n");
    printf("####结束游戏请输入2####\n");
    printf("########################\n");
    printf("请输入你的选择:\n");
    int choice = 0;
    scanf("%d", &choice);
    return choice;
}

void game(){
    //生成一个1-100的随机整数
    int toGuess = rand() % 100 + 1;
    while (1){
        printf("请输入要猜的数字:\n");
        int input;/*保存用户输入数*/
        scanf("%d", &input);
        if (input < toGuess){
            printf("低了!\n");
        }
        else if (input > toGuess){
            printf("高了!\n");
        }
        else{
            printf("猜对了!\n");
            break;
        }
    }
}
int main(){
    //设置随机种子,使用时间戳time(0)
    srand(time(0));
    while (1){
        int choice = menu();
        if (choice == 1){
            game();
        }
        else if (choice == 2){
            printf("程序退出,再见\n");
            break;
        }
        else
        {
            printf("你的输入有误,请重新输入\n");
        }
    }
    system("pause");
    return 0;
}