20194673+ automatically generates four arithmetic problem first edition report

1 needs analysis

Parents of children in order to improve computational abilities, needs every day to the children out of the question, which needs to make a program that generates a certain number of non-repeating topics every day, parents decomposition pressure.

2 Functional Design

basic skills:

(1) automatically generates four arithmetic operation of Equation 2 number less than 10 100 (+ - * /), operation results are required within 100

(2) discarding duplicates equation. = 2 + 3 + 3 = 2 and Equation 2 is repeated and 3 + = 3 + 2 = not repeated formula

Number (3) title can be customized

(4) parameters can be controlled

Whether to include multiplication and division

Controllable range values of the operands (e.g., operands within 100 or within 1000)

Whether operands containing negative　　　　

(5) generating operation to an external file title stored in result.txt

3 Design and Implementation

Scanner using the constructor PrintStream, new new PrintStream PrintStream S = ( "D: /result.txt");

System.setOut (S); this function is called, may be all System.out.println (); output statement, we print the files created folder

Scanner Scanner new new T = ( the System.in); we control input from the keyboard

Math.random (); generating a random function will not be repeated

4 Test Run

Fragment 5

class A {public
public static void main (String [] args) {throws a FileNotFoundException
PrintStream PrintStream new new S = ( "D: /result.txt");
int C;
Scanner Scanner new new T = (the System.in);
the System.out .print ( "Please enter the number of Title:");
int t.nextInt (TM) = ();
// number of the control subject
System.out.print ( "Please enter operand range (e.g., 100, 1000, etc.):" );
int t.nextInt TF = ();
// topic range control
System.out.println ( "Please choose whether there are negative numbers: 1: 0: no");
int t.nextInt ZF = ();
// control positive and negative numbers
System.out.println ( "Please choose whether to include or * /: 2: No 4: is");
int t.nextInt FU = ();
// control symbols
System.setOut (s);

IF (ZF == 0) { // No negative 
                    of System.out.print (A); 
                    } 
            
            IF (FU == 2) { // Select two characters '+' '-' 
                int K = ( int ) (the Math .random () * 2 );
                 Switch (K) { // randomly selected operator 
                Case 0: of System.out.print ( "+" );
                        BREAK ;
                 Case . 1: of System.out.print ( "-" );
                        BREAK ;

Summary 6

My program is not a good foundation, write some code can achieve the basic functions, there is no expansion capabilities, we hope to continue to strengthen in the future of learning. There are some difficulties in achieving the function, but also in the process learned some experience.

7 PSP

PSP2.1	SUMMARY	Plan time (min) required to complete a total of	The actual time required for completion (min)
Planning	plan	10	20
· Estimate	· Estimate how much time this task requires, and planning generally work steps	60	120
Development	Develop	30	40
·· Analysis	Needs analysis (including learning new technologies)	60	60
· Design Spec	Generate design documents	20	20
· Design Review	· Design Review (and his colleagues reviewed the design documents)	20	20
· Coding Standard	Code specifications (development of appropriate norms for the current development)	10	15
· Design	Specific design	10	10
· Coding	Specific coding	50	60
· Code Review	· Code Review	10	10
· Test	· Test (self-test, modify the code, submit modifications)	5	10
Reporting	report	10	10
·· Test Report	· testing report	15	10
· Size Measurement	Computing workload	5	5
· Postmortem & Process Improvement Plan	· Hindsight, and propose process improvement plan	20	20

20194673+ automatically generates four arithmetic problem first edition report

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