Software Engineering Second Job

Title: Please write a "software" that can automatically generate primary arithmetic topics. Allow the program to accept the user to enter the answer, and determine the right and wrong. Finally, the total number of pairs/errors is given.

-Demand Analysis

For the needs of primary school students, design a self-test system, which requires the system can randomly generate two numbers and operators, when the input answer is, can automatically determine the right and wrong, and give hints, exit the system, statistical right, wrong number of questions.

-Design

Using C language to realize the addition, subtraction, multiplication and arithmetic of students ' self-test system

-Code implementation

1#include <stdio.h>2#include <time.h>3#include <stdlib.h>4 voidMain () {5  inta,b,c,d;6  intright=0, wrong=0;7   while(1){8 Srand (Time (NULL)); 9D=a=rand ()% -; TenB= (rand ()%a+a)% -; One   if(a%4==1&&a<b) Ac=a,a=b,b=C; -   if(b==0&&a%4==3) B=rand ()%Ten+1; -   if(a%4==3&&a%b!=0) the   { -Srand (Time (0));  -A=b* (rand ()%a); -   }   +   Switch(d%4) -   { +    Case 0:p rintf ("%d +%d =", A, b); A     Break; at    Case 1:p rintf ("%d-%d =", A, b); -     Break; -    Case 2:p rintf ("%dx%d =", A, b); -     Break; -    Case 3:p rintf ("%d÷%d =", A, b); -     Break; in   }   -scanf"%d",&c); to   Switch(d%4) +   { -    Case 0: the    if(c==a+b) *    { $printf"answer right \ n");Panax Notoginsengright++; -    } the    Else +    { Aprintf"answer error \ n"); thewrong++; +    } -     Break; $    Case 1: $    if(c==a-b) -    { -printf"answer right \ n"); theright++; -    }Wuyi    Else the    { -printf"answer error \ n"); Wuwrong++; -    } About     Break; $    Case 2: -    if(c==a*b) -    { -printf"answer right \ n"); Aright++; +    } the    Else -    { $printf"answer error \ n"); thewrong++; the    } the     Break; the    Case 3: -    if(c==a/b) in    { theprintf"answer right \ n"); theright++; About    } the    Else  the    { theprintf"answer error \ n"); +wrong++; -    } the     Break;Bayi   } theprintf"Press any key to continue, 0 exit! \ n"); the fflush (stdin); -   if(GetChar () = ='0') -     Break;  the  } theprintf"you got the%d question right, you answered the wrong%d question \ n", Right,wrong); the}

-Test

Steps	Time-consuming	Percent (%)
Demand analysis	5	26.3
Design	4	21st
Code implementation	8	42.1
Test	1	5.3
Analysis and summary	1	5.3

Post-mortem analysis and summary

I think writing programs is a big problem, mainly in the programming language is not familiar with, and do not know how to write.

Software Engineering Second Job