Software Engineering Second Job

Topic:

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.

Requirements Analysis:

• Basic functions

  Basic function point 1: realize primary school arithmetic;

  Basic function point 2: The program can accept the user input the answer, and judge the right and wrong;

Basic function point 3: Give the total number of pairs/errors.

Design

• Design point 1: The programming environment of C language to achieve program code writing;
• Design point 2: Randomly generate two numbers, respectively, using 1,2,3,4 to calculate the addition, subtraction, multiplication, division, through the calculation to determine the correctness of the calculation, and statistics of the number of correct and error.

Code implementation

1#include <stdio.h>2#include <stdlib.h>3#include <time.h>4 5 intMain ()6 {7     intX,y,all=0, r=0, e=0, result;8     CharZ;9     intM,n;Tenprintf"Welcome to the Primary School calculator test! \ n"); Oneprintf"Please enter a number from 1 to 4 (1 for addition, 2 for subtraction, 3 for multiplication, 4 for division), and end test when input is Q: \ n");  Ascanf"%d",&m); - Srand ((unsigned) time (NULL));  -         while((Z=getchar ())! ='Q')                the        { -all++; -X=rand ()% -; Y=rand ()% -; -            if(m==1) +            { -printf"%d+%d=", x, y);  +scanf"%d",&z); Aprintf"\ n"); at                if(x+y==z) r++; -                Else -e++; -            } -            Else if(m==2) -            {                                       inprintf"%d-%d=", x, y); -scanf"%d",&z); to                if(x-y==z) r++; +                Else -e++;  the            } *            Else if(m==3) $            {                                    Panax Notoginsengprintf"%d*%d=", x, y); -scanf"%d",&z); the                if(x*y==z) r++; +                Else Ae++; the            } +            Else if(m==4) -            {                              $printf"%d/%d=", x, y); $scanf"%d",&z); -                if(x/y==z) r++; -                Else thee++;  -            }Wuyi            Else                                                         theprintf"wrong input! \ n"); -result= -*r/All ;  Wu        } -printf"your score is:%d\n", result); Aboutprintf"you have finished%d title, the correct%d questions, the wrong%d questions \ n", all,r,e); $        if(result>= -){ -printf"The results are good, don't be proud Oh! \ n"); -        } -        Else{ Aprintf"performance needs to be improved, refueling, don't be discouraged Oh! \ n"); +        } the        return 0;  -}

Program

Addition:

Subtraction:

Multiplication:

Division:

Analysis and summary

PSP Time Consuming:

Psp	Personal Software Process Stage	Time (h)	Time (%)
Design	Specific design	10	20
Coding	Specific code	20	40
Code Review	Code review	5	10
Test	Testing (self-test, code modification)	10	20
Postmortem & Process Improvement Plan	Summarize afterwards and propose process improvement plan	5	10

Summarize:

1. Programming is a process of accumulation, as long as serious thinking, there will always be a solution to the problem;

2. The design of the program needs to meet the requirements of the subject, the primary arithmetic.

Software Engineering Second Job