So here is the code and the explanation below : #include <iostream> using namespace std; void fractions(int x, int y,int w, int z); void addi(int x, int y,int w, int z); void subt(int x, int y,int w, int z); void multiply(int x, int y,int w, int z); void division(int x, int y,int w, int z); main (){ int num1, den1, num2, den2,dec; cout << "Enter Numerator 1:" ; cin >> num1; cout << "\nEnter Denominator 1:" ; cin >> den1; cout << "\nEnter Numerator 2:" ; cin >> num2; cout << "\nEnter Denominator 2:" ; cin >> den2; fractions(num1, den1, num2, den2); cout << "\nEnter 1 for Addition"; cout << "\nEnter 2 for Subtraction"; cout << "\nEnter 3 for Multiplication"; cout << "\nEnter 4 for Division"; cout << "\nWhat operation you want to do:"; cin >> d...