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最新推荐文章于 2024-05-14 08:15:28 发布

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最新推荐文章于 2024-05-14 08:15:28 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/KDIA3/article/details/88775796

本文介绍了使用C语言实现的几个小型程序案例，包括猜数字游戏、二分查找算法、密码验证功能及大小写字母转换程序。这些示例有助于理解基本的控制结构、数组操作和字符串处理等概念。

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1.猜数字游戏
#define _CRT_SECURE_NO_WARNINGS

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

int main() {

int your_num, guess_num;
srand((int)time(0));
guess_num = rand() % 100 + 1;


while (1) {
	printf("请输入你猜的数字\n");
	scanf("%d", &your_num);
	if (your_num > guess_num) {
		printf("猜大了\n");
		printf("\n");
	}
	else if (your_num < guess_num) {
		printf("猜小了\n");
		printf("\n");
	}
	else {
		printf("猜对了\n");
		break;
	}
}
system("pause");

}
2。二分查找（学了冒泡后再完善一下）
#define _CRT_SECURE_NO_WARNINGS

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

int main() {

int arr[5];
int right, left, mid, to_find,i;


to_find = 0;
left = 0;
right = sizeof(arr) / sizeof(arr[0])-1;


printf("请按顺序输入数组");
for (i = 0; i < 5; i++) {
	scanf("%d", &arr[i]);
}
printf("\n");
printf("请输入要查找的数\n");
scanf("%d", &to_find);


while (left <= right) {
	mid = (left + right) / 2;
	if (to_find < arr[mid]) {
		right = mid-1;
	}
	else if (to_find > arr[mid]) {
		left = mid + 1;
	}
	else if (to_find == arr[mid]) {
		printf("找到了!\n");
		break;
	}
	else {
		printf("没有查找数\n");
		break;
	}
}

system("pause");

}
3.输入密码，三次错误则为失败
#define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>

int main() {

char standard_word[]="12345";
char your_word[5];
int i = 0;



//scanf("%s", &standard_word);
//printf("%s", standard_word);


while (i < 3) {


	printf("请输入密码\n");
	scanf("%s", &your_word);

	if (strcmp(standard_word, your_word) == 0) {
		printf("密码正确，登陆成功");
		break;
	}
	i++;
}
if (i == 3) {
	printf("禁止登陆\n");
}
system("pause");

}
4.大小写字母互换，数字则不管
#define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>

int main() {

char word;




while(1) {

	printf("输入你的字符\n");
	scanf("%s", &word);


	if (word <= 57 && word >= 48) {
		;
	}
	else if (word >= 65 && word <= 90) {
		printf("%c\n", word + 32);
	}
	else if (word >= 97 && word <= 122) {
		printf("%c\n", word - 32);
	}
}
system("pause");

}