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.

A: Basic requirements

1: Select the interface design, select Add, subtract, multiply, divide the operation.

2: The system randomly generates two numbers within 100.

3: During the exercise, the user input results from the keyboard, correct and error are prompted, press 6, display the total number of questions and correct number.

Second: Demand analysis

The preparation of primary school arithmetic test system, requires the completion of two-digit addition, subtraction, multiplication, in addition to arithmetic. Can be based on user input to choose the type of operation, the user input answers can be judged correct, after a test, the user can decide whether to continue the next operation.

Three: Design

1: Define variable i,j,a,b,m where I is the correct number of questions, J indicates the number of answers to the wrong question, a, b indicates the number randomly generated, and m receives the result of the operation from the keyboard input.

2: Define add, subtract, multiply, divide the sub function, error and correct all have hints respectively.

3: The main function uses switch to implement user input to select the type of operation, and output the number of questions and correct number of questions. Four: Code implementation

#include <stdio.h> #include <stdlib.h> #include <time.h>int i=0,j=0;void Jia () {int A,b,m;srand (    NULL)); A=1+rand ()%100;    B=1+rand ()%100;    printf ("%d\n", a);    printf ("%d\n", b);    printf ("a+b=?\n");p rintf ("Please enter the result of the operation \ n"); scanf ("%d", &m), if (m==a+b) {printf ("Congratulations on your correct answer \ n"); i++;} else{printf ("You have the wrong answer \ n"); J + +;}}    void Jian () {int A,b,m;srand (time (NULL)); A=1+rand ()%100;    B=1+rand ()%100;if (a<b) {int t=0;t=a;a=b;b=t;}    printf ("%d\n", a);    printf ("%d\n", b);    printf ("a-b=?\n");p rintf ("Please enter the result of the operation \ n"); scanf ("%d", &m), if (m==a-b) {printf ("Congratulations on your correct answer \ n"); i++;} else{printf ("You have the wrong answer \ n"); J + +;}}    void Cheng () {int A,b,m;srand (time (NULL)); A=1+rand ()%20;    B=1+rand ()%20;    printf ("%d\n", a);    printf ("%d\n", b);    printf ("a*b=?\n");p rintf ("Please enter the result of the operation \ n"); scanf ("%d", &m), if (m==a*b) {printf ("Congratulations on your correct answer \ n"); i++;}        else{printf ("You have the wrong answer \ n"); j + +;}}    void Chu () {int A,b,m;srand (time (NULL));    A=1+rand ()%100; B=1+rand ()%100;if (b==0) {B=1+rand ()%100;} IF (a<b) {int t=0;t=a;a=b;b=t;}        while (a%b!=0) {A=1+rand ()%100;    B=1+rand ()%100;}    printf ("%d\n", a);    printf ("%d\n", b);    printf ("a/b=?\n");p rintf ("Please enter the result of the operation \ n"); scanf ("%d", &m), if (m==a/b) {printf ("Congratulations on your correct answer \ n"); i++;}        else{printf ("You have the wrong answer \ n"); j + +;}}
int main () {int M,n=0;while (1) {printf ("1. addition operation \ n");p rintf ("2. Subtraction operation \ n");p rintf ("3. multiplication \ n");p rintf ("4. Division operation \ n"); printf ("Please select"); scanf ("%d", &m), switch (m) {case 1:jia (); break;case 2:jian (); break;case 3:cheng (); Break;case 4:chu ( ); break;} printf ("5. Please re-select \ n");p rintf ("6. End \ n"); scanf ("%d", &n); if (n==6) break;} printf ("You answer the total number%d and the correct number of%d\n", i+j,i); return 0;}

V: System Testing

(1) Addition computing interface, including the overall book and correct number of

(2) Subtraction operator Interface (3) multiplication Interface (4) Division Operation VI: PSP time-consuming statistics

Serial number	Psp	Take	Percent (%)
1	Demand analysis	18	23%
2	Design	20	25.6
3	Code implementation	30	38.5%
4	Test	5	6.4%
5	Analysis and summary	5	6.4%

VII: Analysis and summary

First see the topic, specific how to write, I almost do not understand. Ask the teacher and classmates to understand the problem. Students ' communication can be completed

Software Engineering Second Job