实验2

实验任务1
#include<stdio.h>
#include<stdlib.h>
#include<time.h>

#define N 5

int main()
{
	int grade, number;
	int i;

	srand(time(0));

	for (i = 0; i < N; ++i)
	{
		grade = rand() % 4 + 2018;
		number = rand() % 999 + 1;
		printf(" %d8330%04d\n", grade, number);
	}
	return 0;
}

　　

 实验结论

line16代码的功能是从2018级到2021级随机抽取一个或多个班级

line17的代码功能是从1到999随机抽取一个或多个数字

这个程序的功能是在全校随机抽取一名或多名同学

 

实验任务2
#include<stdio.h>
#include<stdlib.h>
#include<time.h>

#define N 2

int main()
{  
	int n;
	int i,x;
	srand(time(0));
	n = rand() % 30 + 1;
	printf("猜猜2022年4月哪一天会是你的luckey day\n\n开始喽,你有三次机会，猜吧（1~30): ");
	for (i = 0; i <=N; i++)
	{
		scanf_s("%d", &x);
		if (x == n)
		{
			printf("\n哇，猜中了\n\n------------------------------------------------------");
			break;
		}
		else if (x != n)
		{
			if (x > n)
				printf("\n你猜的日期晚了，你的lucky day已经过啦\n\n ");
			else
				printf("\n你猜的日期早了，你的生日还没到呢\n\n");
		}
		if (i == N)
		{
			printf("次数用完啦，偷偷告诉你：4月，你的lucky day 是%d号\n\n------------------------------------------------", n);
			break;
		}
		else
			printf("你再猜(1~30): ");
	}
	return 0;
}

　　      

 

 

实验任务3
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

int main()
{
	char x;
	while (scanf(" %c", &x) != EOF)
	{
		if (x == 'y')
		{
			printf("wait a minute\n");
		}
		else if (x == 'g')
		{
			printf("go go go\n");
		}
		else if (x == 'r')
		{
			printf("stop!\n");
		}
		else {
		printf("something must be wrong...\n");}
	}
	return 0;
}

　　

 

实验任务4
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<math.h>
int main()
{
    float a, n,i;
	while (scanf("%f%f", &n, &a) != EOF)
	{
		float sum = 0.0, s = 0.0;
		for (i = 1; i <= n; i++)
		{
			sum = sum + a * pow(10, (i - 1));
			s = s + i / sum;
		}
		printf("n = %.f, a = %.f, s = %f\n\n", n, a, s);
	}
	return 0;
 }

　　

 

实验任务5
#include<stdio.h>

int main()
{
	int s;
	int j = 1, i = 1;
	while (i <= j)
	{
		for (i = 1; i < j; i++)
		{
			s = i * j;
			printf("%d×%d =%3ld  ", i, j, s);
		}

		if (i = j)
		{
			s = i * j;
			printf("%d×%d =%3ld\n", i, j, s);
			j = j + 1;

		}

		if (j > 9)
		{
			break;
		}
	}
	return 0;
}

　　

 

实验任务6.1
#include<stdio.h>

int main()
{
	int line, col, n, s=1;
	printf("input n: ");
	scanf_s("%d", &n);

	for (line = 1; line <=n; line++)
	{
		for (col = 1; col <=1; col++)
			printf(" O    ");
		printf("\n");
		for (col = 1; col <=1; col++)
		    printf("<H>   ");
		printf("\n");
		for (col = 1; col <= 1; col++)
			printf("I I   ");
		printf("\n\n");
		if(s>=n*4)
		{
			break;
		}
		else
		{
			s++;
		}
	}
}

　　

 

实验任务6.2
#include<stdio.h>

int main()
{
	int line, col, n, s=1;
	printf("input n: ");
	scanf_s("%d", &n);

	for (line = 1; line <=1; line++)
	{
		for (col = 1; col <=5; col++)
			printf(" O    ");
		printf("\n");
		for (col = 1; col <=5; col++)
		    printf("<H>   ");
		printf("\n");
		for (col = 1; col <=5; col++)
			printf("I I   ");
		printf("\n\n");
		if(s>=n*4)
		{
			break;
		}
		else
		{
			s++;
		}
	}
}

　　

 

实验任务6.3
#include<stdio.h>

int main()
{
	int line, col, n,a, i=0,s = 1;
	printf("input n: ");
	scanf_s("%d", &n);
	a = n;
	for (line = 1; line <= n; line++)
	{
		for (col=1;col<=i; col++)
			printf("      ");
		for (col = 1; col <= a*2-1; col++)
			printf(" O    ");
		printf("\n");
		for (col = 1; col <= i; col++)
			printf("      ");
		for (col = 1; col <=a*2-1 ; col++)
			printf("<H>   ");
		printf("\n");
		for (col = 1; col <= i; col++)
			printf("      ");
		for (col = 1; col <=a*2-1 ; col++)
			printf("I I   ");
		printf("\n\n");

		a = a--;
		i++;

		if (s >= n*4)
		{
			break;
		}
		else
		{
			s++;
		}
	}
}

　　

 实验总结

相比于第一次，这一次轻松了许多，而且完成的也很快，思路也是变得逐渐的清晰了，每做完一个程序运行成功时内心会有一种成就感，叶让我我对其越来越感兴趣了。