#include using namespace std; /* How to use For the first input, enter the number you want to use the functions on. For the second, enter which function to run, multiples, factors, evaluateprime or primefactors. If you entered multiples, enter the lower bound in the next line, and the upper bound in the line after that. For example: To calculate the multiples of 12 between 0 and 500, enter 12 multiples 0 500 To calculate the factors of 2048, enter 2048 factors To evaluate if 991 is a prime number, enter 991 evaluateprime To calulate the the prime factors of 2196, enter 2196 primefactors Be careful not to type numbers that are too large, otherwise syntax error or time limit exceeded may occur. Numbers with 6-digits or less are usually fine. */ // Function the calculate multiples int calMul (int mulOf) { int loBound, hiBound; cout << "Please enter the lower limit and the upper limit." << endl; cin >> loBound >> hiBound; // Here I search through from the low bound to the high bound for multiples, and count them. int a = 0; for (int x = loBound; x <= hiBound; x++) { if (x%mulOf == 0) { a++; }; }; cout << "There are " << a << " multiples of " << mulOf << " in and between " << loBound << " and " << hiBound << "." << endl; // Here I again look for multiples, but this time I put them into an array. int b = 0; int numMul[a]; for (int x = loBound; x<= hiBound; x++) { if (x%mulOf == 0) { numMul[b] = x; b++; }; }; cout << "They are "; // Here I go through the array and output the values. int c = 0; while (c < a-1) { cout << numMul[c] << ", "; c++; }; // I seperated the last value with the rest so that I could place the 'and'. cout << "and " << numMul[b-1] << "."; return 0; }; // Function to calculat factors int calFac (int facOf) { // Here I search for factors from 1 to the number, and count them. int a = 0; for (int x=1; x<=facOf; x++) { if (facOf%x == 0) { a++; }; }; cout << facOf << " has " << a << " factors." << endl; // Once again I searched for factors, this time putting them in an array. int b = 0; int numFac[a]; for (int x=1; x<=facOf; x++) { if (facOf%x == 0) { numFac[b] = x; b++; }; }; cout << "They are "; // Here I'm outputting the values inside the array. int c = 0; while (c> g >> h; if (g < 2) { cout << "Please enter a number larger than 1."; } else if (h=="multiples") { calMul(g); } else if (h=="factors") { calFac(g); } else if (h=="evaluateprime") { if (isPrime(g) == true) { cout << g << " is a prime number."; } else { cout << g << " is not prime number." << endl; calFac(g); }; } else if (h=="primefactors") { if (isPrime(g) == true) { cout << g << " has one prime factor, and it is itself."; } else { primeFac(g); }; } else { cout << "Syntax error"; }; };

Calculate multiples, factors, evaluate prime, and prime factors