The only way to success

First, the needs analysis

　　With the era of progress and development of technology, people's life toward a higher level forward, gradually, pen and paper is the keyboard, the mouse substitute. People's environmental awareness gradually increased, a lot of work, study conducted online, rather than a simple pen and paper operations.

Second, the functional design

　　2.1 Basic functions

　　　　(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

　　2.2 extensions

　　　　Able to check your answers are correct

Third, the design and implementation

　　HomeWorkDemo_1 class, the main class Fun write (), a function of two parameters, the subject can set the number and range of values, by calling in the main function, the setting can be accomplished. The main role of the function randomly generated number, calculates randomly. The results of each calculation formula can not exceed 100. Randomly generated number stored into an array, each of the two numbers stored answers to another array. By determining the number of the second array is greater than the cover 100 to determine whether a set of data. The final equation using the input file to the specified directory.

    FW = FileWriter null ; 
        BufferedWriter, BUFW = null ;
         the try { 
            FW = new new FileWriter ( "D: \\ the result.txt", to true ); 
            BUFW = new new BufferedWriter, (FW); 
to determine whether the second parameter by FileWriter save a few the math times

Fourth, the test run

for(int i = 0;i<count;i++) {
			num[number_1++] = random.nextInt(scope)+1;
			num[number_1++] = random.nextInt(scope)+1;
			number_5 = random.nextInt(4)+1;
			int flag = number_5%4;
			switch(flag) {
				case 0:total[number_3++] = (num[number_2++])+(num[number_2++]);break;
				case 1:total[number_3++] = (num[number_2++])-(num[number_2++]);break;
				case 2:total[number_3++] = (num[number_2++])*(num[number_2++]);break;
				case 3:total[number_3++] = (num[number_2++])/(num[number_2++]);break;
			}
			symbol[number_6++] = flag;
			if(number_4<=count) {
				if(total[number_4++]>100) {
					number_1--;
					number_1--;
					number_2--;
					number_2--; 
					number_3--; 
					number_4--; 
					number_6--; 
					COUNT ++; 
				} 
			}	 
The method is not very good. If there is any better way, we can communicate together

　　Five, PSP

PSP2.1	SUMMARY	Plan time (min) required to complete a total of	The actual time required for completion (min)
Planning	plan	120	180
Estimate	· Estimate how much time this task requires, and planning generally work steps	120	180
Development	Develop	80	120
Analysis	Needs analysis (including learning new technologies)	20	20
Design Spec	Generate design documents	10	4
Design Review	Design review (and colleagues reviewed the design documents)	10	10
Coding Standard	Code specifications (development of appropriate norms for the current development)	1	1
Design	Specific design	3	10
Coding	Specific coding	4	10
Code Review	Code Review	12	5
Test	· Test (self-test, modify the code, submit modifications)	10	10
Reporting	report	17	10
Test Report	testing report	10	5
Size Measurement	Computing workload	10	5
Postmortem & Process Improvement Plan	Later summarized, and process improvement plan	5	5

The only way to success

Guess you like