Third time job

The following improvements were made on the basis of the previously written four OP program:

1. The expression contains a negative integer (negative integer minimum 100) of the topic, and negative numbers need to be parenthesized, the user input results without parentheses. such as: (-4) = 8
2. After the user's answer is completed, the program can display the user's answer time

Requirements Analysis:

1. Add and Function

2. Use the modular design concept to modify the previous code to encapsulate the "compute function"

Design:

1. Add Random negative function

2. Time taken to join the program

Code implementation:

Suanfa.h

#define _crt_secure_no_warnings#include "stdio.h" #include "stdlib.h" int right=0, wrong=0; void Jiafa () {int A, B, c;//definition a , B,CA = -100 + rand ()% 201;//randomly generates -100~100 number B = -100 + rand ()% 201;//randomly generates -100~100 number printf ("Please Answer: (%d) + (%d) =", A, b); scanf ("%d", &c);//keyboard accepts the value if (A + b! = c)//Determines whether the input value is correct {printf ("Error \ n"); wrong++;//logs the error value +1}else{printf ("Correct \ n"); right++; Record correct value +1}}void JIANFA () {int A, B, c;//definition A,B,CA = -100 + rand ()% 201;//randomly generated -100~100 number B = -100 + rand ()% 201;//randomly generated -100~10 0 of the number printf ("Please Answer: (%d)-(%d) =", A, b); scanf ("%d", &c), if (A-a-d! = c)//Determine if the input value is correct {printf ("Error \ n"); wrong++;} else{printf ("correct \ n"); right++;}} void Chengfa () {int A, B, c;//definition A,B,CA = -100 + rand ()% 201;//randomly generates -100~100 number b= -100 + rand ()% 201;//randomly generates -100~100 number if (a <0 && b>0) {printf ("Please Answer (: (%d) *%d=", A, b);} if (a<0 && b<0) {printf ("Answer: (%d) * (%d) =", A, b);} if (a>0 && b<0) {printf ("Answer:%d * (%d) =", A, b);} if (a>0 && b>0) {printf ("Please answer:%d *%d=", A, b);} scanf ("%d", &c)if (a*b! = c)//Determine if the input value is correct {printf ("Error \ n"); wrong++;} else{printf ("correct \ n"); right++;}}                void Chufa () {Double A, B, c;//definition A,B,CA = -100 + rand ()% 201;//randomly generates -100~100 number B = -100 + rand ()% 201; Randomly generates -100~100 's digital printf ("Please Answer: (%LF)/(%LF) =", A, B), scanf ("%lf", &c), if (A/b! = c)//Determine if the input value is correct {printf ("Error \ n"); wrong ++;} else{printf ("correct \ n"); right++;}}

Zhuchengxu.cpp

#define _crt_secure_no_warnings#include "stdio.h" #include "stdlib.h" #include "suanfa.h" #include <time.h># include<string.h> #include <iostream>    //define global variables R W record pairs of questions and wrong number of questions void main ()                                 //main function {int a = clock (); int x , con = 0;                         Define the X-value with the con value printf ("C-language four operator \ n"); while (1) {printf ("Select algorithm: \n1 plus 2 minus 3 by 4 except \ n"); if (con = = 0) scanf ("%d", &x); switch (x)                          //Judge input Value Select Sub Function program {case 1:JIAFA (); break;case 2:jianfa (); break;case 3:chengfa (); break;case 4:chufa (); printf ("1 redo, 2 change algorithm, 3 exit \ n"); scanf ("%d", &con), if (con = = 1) con = 1;if (con = 2) con = 0;if (con = 3) break;} printf ("Total number%d, correct%d problem, error%d!") \ n ", right + wrong, right, wrong); End Rebate W r value int b = Clock ();//To this end int c = b-a;//The calculated unit is milliseconds printf ("%d milliseconds \ n", c); //}

Procedure: Analysis and Summary: 1.PSP Time-consuming statistics

2. Summary: Add some function, strengthen team cooperation ability, still have many function not, realize also need to study diligently

Co-author Fan Luo

Third time job