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#include <iostream>
#include <sstream>
#include <string>
void calcOperator(int,int,int,int,std::string);
void calcReduction(int, int);
void calc();
int main()
{
char answer;
do
{
calc();
std::cout << "\nDo you wish to continue? (y/n): ";
std::cin >> answer;
}while(answer == 'y' || answer == 'Y');
/*** Saving for later
if(s.find("*") != std::string::npos){std::cout << "\nMultiply";}
else if(s.find("+") != std::string::npos){std::cout << "\nAdd";}
else if(s.find("/") != std::string::npos){std::cout << "\nDivide";}
else if(s.find("-") != std::string::npos){std::cout << "\nSubtract";}
***/
return 0;
}
void calc()
{
int nOneInt,dOneInt,nTwoInt,dTwoInt;
std::string nOne,dOne,nTwo,dTwo,operatorValue,s,delimiter,delimiter2,resultInString;
std::cout << "\nEnter a fraction expression: ";
std::getline(std::cin,s); //get the fraction expression from the user and store in string var s
delimiter = "/";
delimiter2 = " ";
//establish delimeters that are expected to be in the fraction expression
std::cout << "check1";
nOne = s.substr(0, s.find(delimiter)); //make numerator one equal to any string before delimeter one
std::istringstream (nOne) >> nOneInt; //convert nOne from string to int
s = s.substr(nOne.size() + delimiter.size(),s.size() - nOne.size()); //remove the numerator plus the first delimeter
dOne = s.substr(0,s.find(delimiter2)); //find demoinator one by finding delimeter 2 and extracting before value
std::istringstream (dOne) >> dOneInt; //convert dOne from string to int
s = s.substr(dOne.size() + delimiter2.size(), s.size() - dOne.size()); //remove first denominator plus space
operatorValue = s.substr(0, s.find(delimiter2)); //make operator equal to - or / or * or +
s = s.substr(operatorValue.size() + delimiter2.size(), s.size() - operatorValue.size()); //remove operator from string
nTwo = s.substr(0,s.find(delimiter)); //make numerator two equal to fractional numerator 2
std::istringstream (nTwo) >> nTwoInt; //convert nTwo from string to int
s = s.substr(nTwo.size() + delimiter.size(), s.size() - nTwo.size()); //remove second slash plus numerator 2
dTwo = s; //the only thing left is the value of denominator 2
std::istringstream (dTwo) >> dTwoInt; //convert dTwo from string to int
calcOperator(nOneInt,dOneInt,nTwoInt,dTwoInt,operatorValue);
operatorValue.clear();
nOne.clear();
dOne.clear();
nTwo.clear();
dTwo.clear();
s.clear();
}
void calcOperator(int num1, int den1, int num2, int den2, std::string instructionString)
{
int newN,newD;
if(instructionString.find("*") != std::string::npos)
{
//n1/d1 * n2/d2 = n1*n2 / d1*d2
newN = num1 * num2;
newD = den1 * den2;
calcReduction(newN,newD);
}
else if(instructionString.find("+") != std::string::npos)
{
//n1*d2 + d1*n2 / d1*d2
newN = (num1 * den2) + (den1 * num2);
newD = den1 * den2;
calcReduction(newN,newD);
}
else if(instructionString.find("/") != std::string::npos)
{
//n1/d1 / n2/d2 = n1*d2 / d1*n2
newN = num1 * den2;
newD = den1 * num2;
calcReduction(newN,newD);
}
else if(instructionString.find("-") != std::string::npos)
{
//n1/d1 - n2/d2 = n1*d2 - d1*n2 / d1*d2
newN = (num1 * den2) - (den1 * num2);
newD = den1 * den2;
calcReduction(newN,newD);
}
}
void calcReduction(int num, int den)
{
bool reductionFlag = false;
for(int i = den; i > 0; i--)
{
if(num % i == 0 && den % i == 0)
{
num = num / i;
den = den / i;
reductionFlag = true;
}
}
std::cout << num << "/" << den << ".";
if(reductionFlag == true){
std::cout << " The result was reduced.";
}
}
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