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#include <iostream>
#include <cstdlib> //randint
#include <ctime> //randint
#include <vector>
#include <fstream>
#include <sstream>
using namespace std;
class Utility{
bool srand_has_exc;
public:
Utility(){
srand_has_exc = false;
}
//random
int randint(int start=0, int maxnum=0, int increment=0){
/*generate a random int max at maxnum, starting from start, increment add value to both
*
* maxnum = max number minus one
* start = number no less than accepted
* increment = add increment to
*/
if (!srand_has_exc){
srand(time(0));
srand_has_exc = true;
}
int num=0;
while (true){
num = (rand() % maxnum) + increment;
if (start == 0)
return num;
else if (num < start)
continue;
else
break;
}
return num;
}
//basic operations
string reverse(string s){
return string(s.rbegin(), s.rend());
}
int max(int a[], int size){
int mx = a[0];
for(int i=0; i<size; i++){
if(mx < a[i]){
mx = a[i];
}
}
return mx;
}
int min(int a[], int size){
int mn = a[0];
for(int i=0; i<size; i++){
if(mn > a[i]){
mn = a[i];
}
}
return mn;
}
int max(vector<int> v){
int mx = v[0];
for (vector<int>::size_type i = 0; i != v.size(); i++) {
if(mx < v[i]){
mx = v[i];
}
}
return mx;
}
int min(vector<int> v){
int mn = v[0];
for (vector<int>::size_type i = 0; i != v.size(); i++) {
if(mn > v[i]){
mn = v[i];
}
}
return mn;
}
//file i/o
void write(string filename, string data){
ofstream f;
f.open(filename);
f << data;
f.close();
}
void write(string filename, vector<string> v, string sep="\n"){
ofstream f;
f.open(filename);
for (vector<int>::size_type i = 0; i != v.size(); i++) {
f << v[i] << sep;
}
f.close();
}
void open(string filename){ //get entire line
string s = "";
ifstream f;
f.open(filename);
while(getline(f, s)){
cout << s <<endl;
}
f.close();
}
//type conversion
string int2str(int inter){
//convert from int to string
stringstream num_str;
num_str << inter;
return num_str.str();
}
int str2int(string str){
//convert from string to int
int i;
stringstream ss(str);
ss >> i;
return i;
}
int flo2int(float floater){
//convert from float to int
//rounds down
int i = static_cast<int>(floater);
return i;
}
int dou2int(double d){
//convert from double to int
//rounds down
int i = static_cast<int>(d);
return i;
}
string cha2str(char ch){
//ocnvert from cahr to string
stringstream ss;
string s;
ss << ch;
ss >> s;
return s;
}
char str2cha(string stringer){
//convert from string to char
stringstream ss;
char c;
ss << stringer;
ss >> c;
return c;
}
int cha2asc(char ch){
//convert from character to ascii number
int i;
i = (int)ch;
return i;
}
char asc2cha(int num){
//convert from ascii number to character
char c;
c = (char)num;
return c;
}
};
void test(){
Utility util;
for (int i=0; i<10; i++){
cout << util.randint(5, 25) << ' ';
}
cout << endl;
string gender[2] = {"Female", "Male"};
for (int i=0; i<10; i++){
cout << gender[util.randint(0,2)] << ' ';
}
cout << endl;
cout << util.reverse("some random string") << endl;
int a[10];
for (int i=0; i<10; i++){
a[i] = util.randint(0,25);
cout << a[i] << ' ';
}
cout << endl;
cout << "max num: " << util.max(a, 10) << endl;
cout << "max num: " << util.min(a, 10) << endl;
vector<int> v;
for (int i=0; i<util.randint(3,10); i++){
v.push_back(util.randint(0,100));
}
for (vector<int>::size_type i = 0; i != v.size(); i++) {
cout << v[i] << ' ';
}
cout << endl;
cout << util.max(v) << endl;
cout << util.min(v) << endl;
string name = "test.html";
util.write(name, "some\nrandom\ndata");
util.open(name);
vector<string> s = {"test", "this", "right\nnow"};
util.write(name, s);
util.open(name);
cout << util.int2str(1024).substr(0,3) << endl;
cout << util.str2int("24") + 1 << endl;
cout << util.flo2int(10.1) - 5 << endl;
cout << util.cha2str('c') + "h" << endl;
cout << util.str2cha("s") + 'h' << endl;
cout << util.cha2asc('c') << endl;
cout << util.asc2cha(99) << endl;
}
int main (){
test();
}
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