/*Hello guyz I am Mukul this is my 4th version of factorial calculator. Plz enter a value between 0 and 1490 and press the factorial sign'!' just after the number. If you type something wrong nothing wrong will happen just the answer won't be correct. */ #include #include using namespace std; void multiply(int x, vector &v) { int carry = 0; for (int i=0; i=0) { vector v; v.push_back (1);//continue here for (int x=2; x<=n; x++) multiply(x, v); for (int i=v.size()-1; i>=0; i--) cout << v[i]; } else if (n<0) { cout << "Error"; } else { cout << "Infinity"; } } int cond(char s) { if(s == '0' || s == '1' || s == '2' || s == '3' || s == '4' || s == '5' || s == '6' || s == '7' || s == '8' || s == '9') { return 1; } } int pow(int n) { int power = 1; for(; n>0 ; n--) { power *= 10; } return power; } int num(char s) { int n; if(s == '0') n = 0; if(s == '1') n = 1; if(s == '2') n = 2; if(s == '3') n = 3; if(s == '4') n = 4; if(s == '5') n = 5; if(s == '6') n = 6; if(s == '7') n = 7; if(s == '8') n = 8; if(s == '9') n = 9; return n; } int main() { cout << "Welcome to the Factorial Calculator!!!" << endl; cout << endl << "Tell Me which factorial do you want." << endl << endl << endl; string s; // string n = "56"; cin >> s; int i = s.length(); if(s[i-1] == '!') { //cout << i << endl; //cout << s; int sum = 0; int n = 0; bool c = true; if(cond(s[i-2]) == 1) { for(;i-2>=0;i--) { if(cond(s[i-2]) == 1) { int numb = num(s[i-2]); //cout << numb; int number = numb * pow(n); sum += number; n++; } else { c = false; } } //cout << sum; cout << sum << "! = "; facto(sum); //cout << endl << s << " = "; //facto(sum); //cout << endl << n; } else if(c == false) { cout << "ERROR" << endl; } else { cout << "ERROR" << endl; } } return 0; }

Factorial Calculator v4