【C语言】北邮国院大一下期末复习
作者:互联网
由于2020年上半年疫情封校,C语言期末是线上大作业形式。
下文是要求,大概就是做一个计算器。
CPF 课程 2020
写一个能帮助小学生练习数学的程序。
a) 程序将首先向用户询问其 ID 号(包括两 个大写字母和 4 位数字),例如。
请输入您的 ID 号:AB1234
The program should have ID input validation.
然后程序提示三个选项:
(1) 开始测试
(2) 检查分数
(3) 退出
b)b) b) 测试:该程序将给出 10 道数学问题,例如:
12 × 3 × 36
48 × 32 × 80
...
56 / 28 = 2
注意:
i) 学生将在下一个问题给出之前回答每个问题。
ii) 问题应包括四种数学运算:加法、减法、乘法和除法。它们是随机生成的。相邻的问题应为不同的操作。每个操作必须appear至少出现一次。
iii) 随机生成问题的数字。但是,必须确保问题和结果都 小于 than 100 和大于 0。操作数和结果应为整数。
iv) 十个问题完成后,记录学生完成 completing这十个问题所用的时间。
v) 给每个学生一个分数。保存此学生的ID、他/她的分数以及使用的时间,放入名为"record.txt"的文件中。 “
vi) 在屏幕上打印以下信息:
奎斯. |更正 Answ。 | 你的Answ
c) 检查分数: L从文件"记录.txt"” 中为该学生提供的所有历史分数,例如:
您以前的记录包括:
AB1234 80 150 秒
AB1234 50 182 秒
AB1234 90 98 秒
您将根据程序的标记:
(1) 科雷 茨ness
(2) 可读性
(3) 稳健性
(4) 简洁
评分标准
- 代码首先由反抄袭程序检测,对于疑似抄袭代码,经手工检查确认后0分
- 代码中不能出现中文
- 所有代码用C-Free5.0 professional编译,不通过0分;每个warning扣减10分;超过两个0分
序号 | 内容 | 扣分 | 备注 |
函数少于5个 | -10 | 每少一个-10 | |
没使用结构 | -10 | FILE 指针除外 | |
没使用指针 | -10 | FILE 指针除外 | |
无缩进等 | -10 | 编程风格 | |
命名不规范 | -10 | ||
无注释 | -10 | 不能使用中文 |
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
int main()
{
int i , n = 1 , option , score = 0 , ad , su , mu , di ;
int a[10] , b[10] , oper[10] , result[10] , put[10];
int *rPtr = result;
char id[7] ;
time_t start , end;
int add(int x , int y);
int sub(int x , int y);
int mult(int x , int y);
int divi(int x , int y);
void check(char[]);
FILE *data;
struct numsym
{
int sequ;
char opera;
};
struct numsym link[4] = {{0 , '+'},{1 , '-'},{2 , '*'},{3 , '/'}};
//Determine if the ID number is vaild.
while(n)
{
printf("Please input your ID number(e.g. AB1234): ");
scanf("%s",&id);
//Determine letter format
if(id[0] >= 'A' && id[0] <= 'Z' && id[1] >= 'A' && id[1] <= 'Z' && id[6] == '\0');
else
{
printf("Sorry , please type in the correct ID number.\n");
continue;
}
//Determine number format
for(i = 2 ; i <= 5 ; i++)
{
if(id[i] >= '0' && id[i] <= '9')
n = 0;
else
{
printf("Sorry , please type in the correct ID number.\n");
n = 1;
}
}
}
//Select three choices
choice://use goto function to return the three choices
printf("Then the program prompts three choices:\n(1) Start a test\n(2) Check scores\n(3) Exit\n");
scanf("%d", &option);
switch(option)
{
//Start a test
case 1:
printf("---------------------------------------\n");
printf("The test begins now.\n");
srand(time(NULL));
time(&start);//count time
//Set the question one by one
//Determine the operator randomly
withoutnull://use goto function to make each operation will appear at least once
for(i = 0 ; i < 10 ; i++)
{
//The adjacent questions should be different operations
oper[i] = rand() % 4;
while(i > 0 && oper[i] == oper[i-1])
{
oper[i] = rand() % 4;
continue;
}
}
//make each operation will appear at least once
ad = 0 ; su = 0 ; mu = 0 ; di = 0;
for(i = 0 ; i < 10 ; i++)
{
switch(oper[i])
{
case 0 : ad++ ; break ;
case 1 : su++ ; break ;
case 2 : mu++ ; break ;
case 3 : di++ ; break ;
}
}
if(ad == 0 || su == 0 || mu == 0 || di == 0)
goto withoutnull;
for(i = 0 ; i < 10 ; i++)
{
//Determine the number randomly
do
{
a[i] = rand() % 100 ;
b[i] = rand() % 100 ;
//calculate data
switch(oper[i])
{
case 0:
result[i] = add(a[i],b[i]);//Quote addition
break;
case 1:
result[i] = sub(a[i],b[i]);//Quote subtration
break;
case 2:
result[i] = mult(a[i],b[i]);//Quote multiplication
break;
case 3:
result[i] = divi(a[i],b[i]);//Quote division
break;
}
}while(result[i] <= 0 || result[i] >= 100 || (oper[i] == 3 && a[i] % b[i] != 0));
printf("%2d %c %2d = ",a[i] , link[oper[i]].opera , b[i] );
scanf("%d" , &put[i]);//Student input result
if(put[i] == result[i])
score = score + 10 ;
}
time(&end);//count time
//Out the data just caculated
printf("---------------------------------------\nYou get %d score(s) in %d seconds.\n" , score , end-start);
printf("And that is your records that you have just done.\n Ques. | Correct Answ. | Ur Answ\n");
for(i=0;i<10;i++)
printf("%-2d %c %-2d = %-3d %d\n", a[i] , link[oper[i]].opera , b[i] , *(rPtr+i) , put[i]);
//Save the information into the file
data = fopen("record.txt", "a+"); //save the information into the file
fprintf(data,"%s %d %d\n", id , score , end-start);
fclose(data);
printf("---------------------------------------\n");
goto choice;
break;
//Check scores
case 2:
check(id);
printf("---------------------------------------\n");
goto choice;
break;
//quit the program
case 3:
printf("---------------------------------------\n");
printf("This program is about to quit.\n");
break;
//save the program
default:
printf("Sorry , please type in the correct number.\n");
goto choice;
break;
}
return 0;
}
int add(int x , int y)//Define addition
{
int result;
result = x + y;
return result;
}
int sub(int x , int y)//Define subtration
{
int result;
result = x - y;
return result;
}
int mult(int x , int y)//Define multiplication
{
int result;
result = x * y;
return result;
}
int divi(int x , int y)//Define division
{
int result;
result = x / y;
return result;
}
//The function to check scores
void check(char id[])
{
FILE *file;
int ggrade , gtime , j = 0;
char gid[6];
file=fopen("record.txt","r"); //open file
printf("---------------------------------------\n");
if(file == NULL)
printf("Sorry , there is no record.");
fscanf(file,"%s %d %d" , gid , &ggrade , >ime);
printf("Your previous records are:\n");//print the previous records
while(!feof(file))
{
if(strncmp(id , gid , 6) == 0)//compare data
{
j = 1;
printf("%s %d %dseconds\n\n" , id , ggrade , gtime);//output data
}
fscanf(file,"%s %d %d" , gid , &ggrade , >ime);//read data
}
if( j == 0)
printf("Sorry, there is no previous grade.\n");
fclose(file);//close file
}
标签:oper,10,int,北邮,C语言,break,case,result,国院 来源: https://blog.csdn.net/qq_59362610/article/details/121595351