Code progress of pairing project programming

Since the initial project was designed according to the idea of the module, it was already a modular program.

 

The program teacher raised the following requirements for the peer project:

 

 Calc()

This calc function accepts the input of a string (the string contains the operator formula, such as "5 + 3.5", "7/8-3/8", and "3 + 90*(-0.3 ), the return value of this module is a string. For example, the result of the previous examples is ("17.5", "1/2", "-24 ").

 

So I want to addDecimalAndNegativeComputing functions.

And set the return value of the module 【String] (The current return type is fraction)

Therefore, I added a tostring function to the fraction class. Which can convert both the score and decimal point to the string-type

String fraction: tostring () {// The calculation result is changed to string char T [10]; sprintf (T, "% d", num); string S1 = T; if (Den = 1) {return S1;} else {sprintf (T, "% d", Den); string S2 = T; return S1 + "/" + S2 ;}} string fraction: tostring2 (INT jingdu) {// The calculation result is changed to string char T [10]; float result = num * 1.0/DEN; float result2 = int (result * POW (10.0, jingdu)/POW (10.0, jingdu); sprintf (T, "% F ", result2); string S1 = T; return S1 ;}

 

For negative calculation, the negative number may appear at the beginning:-1 + 4/2*5 or 2 + 4 * (-4) + 2 with parentheses. So after finding this rule, I find a negative number and add 0 to it.

Exp: exp (string s) {STR = ""; // negative Computation for (INT I = 0; I <S. size (); I ++) {if (I = 0 & S [I] = '-' | s [I] = '-' & S [I-1] = '(') STR + = "0"; STR = STR + s [I];}

For decimal operations, I used to convert decimal points into scores.

For example, 3.45 is 345/100.

In addition, I have also designed three types of exceptions: "A maximum of several operators, the number of data ranges, the calculation precision (a few decimal places are retained, and so on)" and

void Exp::setting(int geshu,int jingdu,int max,int min){    this->geshu=geshu;    this->jingdu=jingdu;    this->max=max;    this->min=min;}

 

The following statement is added to the setfraction (string STR, int Max, int min) function and an exception is thrown.

If (Num> max | num <min | Den> max | Den <min) throw string ("out of range"); else if (Den = 0) throw string ("the denominator cannot be 0 ");

Add the following statement in setexp (string s) to throw an exception.

If (Cal> Geshu) throw string ("too many operators ");

 

Add the tostring2 function. The specific implementation method is as follows: [5, 4321] to retain two decimal places (the precision is 2), multiply the value by 5.4321, get the integer, and divide it by 100, it becomes 5.43.

String fraction: tostring2 (INT jingdu) {// The calculation result is changed to string char T [10]; float result = num * 1.0/DEN; float result2 = int (result * POW (10.0, jingdu)/POW (10.0, jingdu); sprintf (T, "% F", result2); string S1 = T; return S1 ;}

 

 

This is probably the case. For more information about the test, see my partner's blog:

Http://www.cnblogs.com/xDan/

 

Code progress of pairing project programming