C语言寒假大作战04

这个作业属于哪个课程	https://edu.cnblogs.com/campus/zswxy/CST2019-4
这个作业的要求在哪里	https://edu.cnblogs.com/campus/zswxy/CST2019-4/homework/10277
这个作业的目标是	学习几个头文件
作业正文	在上次作业的基础上添加每个题目的答案
参考文献	百度

2.2.2设计思路及所遇到的问题

设计思路:在上次作业的基础上让每个随机题目出现答案
问题:对于几个头文件的灵活运用还不是很熟,在使用字符串(string)头文件与随机srand及指针的使用还是小白;

2.2.3程序截图

2.2.4程序代码

include <stdio.h>

include <stdlib.h>

include <time.h>

include <string.h>

void menu();
void help();
void one();void operation_1();
void two();void operation_2();
void three();void operation_3();
void error();
int main()
{
int opt=1,n;
printf("口算生成器\n");
printf("欢迎使用口算生成器:\n");
printf("\n");
help();
while(opt!=0)
{
menu();
printf("请输入操作> ");
scanf("%d",&opt);
printf("<执行操作:)\n");
printf("\n");
switch(opt)
{
case 1:operation_1();break;
case 2:operation_2();break;
case 3:operation_3();break;
case 4:help();break;
case 5:printf("程序结束, 欢迎下次使用\n");
printf("任意键结束……");
opt=0;
default:error();break;
}
}
return 0;
}
void menu()
{
printf("\n");
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");
}
void help()
{
printf("\n");
printf("帮助信息\n");
printf("您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");
}
void operation_1()
{
printf("请输入生成个数>");
one();
}
void operation_2()
{
printf("请输入生成个数>");
two();
}
void operation_3()
{
printf("请输入生成个数>");
three();
}
void one()
{
int n,a,b,c,d;
time_t t;
srand((unsigned) time(&t));
printf("现在是一年级题目:\n");
scanf("%d",&n);
printf("<执行操作:)\n");
for (int i=0;i<n;i++)
{
a=rand() % 10;
b=rand() % 10;
c=rand() % 2;
if (c==0)
{

   d=a+b;
   printf("%d + %d = %d\n",a,b,d);
}
else
{
   d=a-b;
   printf("%d - %d = %d\n",a,b,d);
   }

}

}
void two()
{
int n,a,b,c;
float d;
time_t t;
srand((unsigned) time(&t));
printf("现在是二年级题目:\n");
scanf("%d",&n);
printf("<执行操作:)\n");
for (int i=0;i<n;i++)
{
a=rand() % 10;
b=rand() % 10;
c=rand() % 2;
if (c0)
{
d=a*b;
printf("%d * %d = %g\n",a,b,d);
}
else{
while(b0)
{
b=rand() % 10;
}
d=a/(b*1.0);
printf("%d / %d = %g\n",a,b,d);
}
}

}
void three()
{
int n,m,i,a,b,c;
float z;
char fh1[2],fh2[2];
time_t t;
srand((unsigned) time(&t));
printf("现在是三年级题目:\n");
scanf("%d",&n);
printf("<执行操作:)\n");
char fh[4][6] = {"","/","+","-"};
for (int i=0; i<n; i++)
{
a=rand() % 100;
b=rand() % 100;
c=rand() % 100;
while (a0||b0||c==0)
{
a=rand() % 100;b=rand() % 100;c=rand() % 100;
}
strcpy(fh1,fh[rand() % 3]);
strcpy(fh2,fh[rand() % 3]);
if(strcmp(fh1,"")0&&strcmp(fh2,"*")0)
{
z = a * b * c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"")0&&strcmp(fh2,"/")0)
{
z = a * b / (c1.0);
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"")0&&strcmp(fh2,"+")0)
{
z = a * b + c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"")0&&strcmp(fh2,"-")0)
{
z = a * b - c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"/")0&&strcmp(fh2,"+")0)
{
z = a / (b1.0) + c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"/")0&&strcmp(fh2,"-")0)
{
z = a / (b1.0) - c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"/")0&&strcmp(fh2,"/")0)
{
z = a / (b1.0) / (c1.0);
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"+")0&&strcmp(fh2,"-")0)
{
z = a + b - c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"+")0&&strcmp(fh2,"+")0)
{
z = a + b + c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"-")0&&strcmp(fh2,"-")0)
{
z = a - b - c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"/")0&&strcmp(fh2,"*")0)
{
z = a / (b1.0) * c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"+")0&&strcmp(fh2,"/")0)
{
z = a + b / (c1.0);
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"+")0&&strcmp(fh2,"*")0)
{
z = a + b * c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"-")0&&strcmp(fh2,"/")0)
{
z = a - b / (c1.0);
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"-")0&&strcmp(fh2,"+")0)
{
z = a - b + c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
else if(strcmp(fh1,"-")==0&&strcmp(fh2,"")==0)
{
z = a - b * c;
printf("%2d %s %2d %s %2d = %g\n",a,fh1,b,fh2,c,z);
}
}