C语言寒假大作战04

1. 表头###

这个作业属于哪个课程	https://edu.cnblogs.com/campus/zswxy/CST2019-1
这个作业要求在哪里	https://edu.cnblogs.com/campus/zswxy/2019TA/homework/10263
这个作业的目标	学习并掌握基本的git命令
其他参考文献	%g

2. 作业内容###

2.1 设计思路与问题#####

设置相对应的变量，然后用随机数来给它赋值，在用变量进行计算，输出；

2.2 程序结果截图#####

2.3 程序代码#####

#include<stdio.h>
#include<stdlib.h>
int y;
int i;
int num1, num2, num3, flag, kt;
double result;
char op[4] = { '+','-','*','/' };
void menu()
{
	printf("操作列表：\n");
	printf("1)一年级     2）二年级     3）三年级\n");
	printf("4)帮助       5）退出程序\n");
	printf("请输入操作> ");
}
void help()
{
	printf("帮助信息：");
	printf("\n");
	printf("你需要输入命令代号来进行操作，且\n");
	printf("一年级题目为不超过十位的加减法;\n");
	printf("二年级题目为不超过百位的乘除法;\n");
	printf("三年级题目为不超过百位的加减乘除混合题目;\n");
	printf("\n");
	menu();
}
void error()
{
	printf("< 执行操作：）\n");
	printf("\n");
	printf("Error!!!\n错误操作指令，请重新输入\n");
	printf("\n");
	menu();
}
void first_grade()
{
	printf("< 执行操作：）\n\n");
	printf("现在为一年级题目：\n");
	printf("输入生成题目数 > ");
	scanf("%d", &y);
	printf("< 执行操作：）");
	operation_1();
}
void second_grade()
{
	printf("< 执行操作：）\n\n");
	printf("现在为二年级题目：\n");
	printf("输入生成题目数 > ");
	scanf("%d", &y);
	printf("< 执行操作：）");
	operation_2();
}
void third_grade()
{
	printf("< 执行操作：）\n\n");
	printf("现在为三年级题目：\n");
	printf("输入生成题目数 > ");
	scanf("%d", &y);
	printf("< 执行操作：）");
	operation_3();
}
int operation_1()
{
	printf("\n\n");
	for (i = 0; i < y; i++)
	{
		num1 = rand() % 10;
		num2 = rand() % 10;
		flag = rand() % 2;
		if (flag == 0)
			result = num1 + num2;
		else
			result = num1 - num2;
		printf("%d %c %d = %2.0f\n", num1, op[flag], num2, result);
	}
	printf("\n");
	menu();
}
int operation_2()
{
	printf("\n\n");
	for (i = 0; i < y; i++)
	{
		num1 = rand() % 10;
		if (op[(rand() % 2) + 2] == '/')
		{
			num2 = (rand() % 9) + 1;
			result = num1*1.0 / num2*1.0;
			printf("%d / %d = %g\n", num1, num2, result);
		}
		else
		{
			num2 = rand() % 10;
			result = num1 * num2;
			printf("%d * %d = %g\n", num1, num2, result);
		}
	}
	printf("\n");
	menu();
}
int operation_3()
{
	printf("\n\n");
	for (i = 0; i < y; i++)
	{
		num1 = rand() % 100;
		printf("%2d ", num1);
		if (op[rand() % 4] == '/')
		{
			num2 = (rand() % 99) + 1;
			printf("/ %2d ", num2);
		}
		else
		{
			flag = rand() % 3;
			num2 = rand() % 100;
			printf("%c %2d ", op[flag], num2);
		}
		if (op[rand() % 4] == '/')
		{
			num3 = (rand() % 99) + 1;
			if (flag == 0)
				result = num1 + (num2 * 1.0 / num3 * 1.0);
			else if (flag == 1)
				result = num1 - (num2 * 1.0 / num3 * 1.0);
			else
				result = num1 * num2 * 1.0 / num3 * 1.0;
			printf("/ %2d = %g", num3, result);
		}
		else
		{
			num3 = rand() % 100;
			kt = rand() % 3;
			if (flag == 0 && kt == 0)
				result = num1 + num2 + num3;
			else if (flag == 0 && kt == 1)
				result = num1 + num2 - num3;
			else if (flag == 0 && kt == 2)
				result = num1 + (num2 * num3);
			else if (flag == 1 && kt == 0)
				result = num1 - num2 + num3;
			else if (flag == 1 && kt == 1)
				result = num1 - num2 - num3;
			else if (flag == 1 && kt == 2)
				result = num1 - (num2 * num3);
			else if (flag == 2 && kt == 0)
				result = num1 * num2 + num3;
			else if (flag == 2 && kt == 1)
				result = num1 * num2 - num3;
			else
				result = num1 * num2 * num3;
			printf("%c %2d = %g", op[kt], num3, result);
		}
		printf("\n");
	}
	printf("\n");
	menu();
}
int main()
{
	printf("==============口算生成器===============");
	printf("\n");
	printf("欢迎使用口算生成器：");
	printf("\n\n");
	help();
	menu();
	int x;
	while (1)
	{
		scanf("%d", &x);
		switch (x)
		{
		case 1:
			first_grade();
			break;
		case 2:
			second_grade();
			break;
		case 3:
			third_grade();
			break;
		case 4:
			help();
			break;
		case 5:
			break;
		default:
			error();
		}
		if (x == 5)
		{
			break;
		}
	}
	printf("< 执行操作：）\n\n程序结束，欢迎下次使用\n任意键结束...");

	return 0;
}

2.4 gitee上传截图与链接#####

作业三四都在这个目录里面；
我的gitee