If statements in c++ doubles - c++

Question

#include <iostream>
#include <windows.h>
#include <cstdlib>
#include <stdlib.h>
using namespace std;
int main()
{
int x,y,z;
cout<<"welcome to guessing game\nplayer one pick your number: ";
cin>>x;
if (x < 0)(x > 100);
{
cout<<"out of number range";
}
Sleep(2000);
system("cls");
cout<<"ok player 2 pick the guess";
cin>>y;
if (x == y){
cout<<"congrats you got it right";
}
else{
if (x < y){
cout<<"Go lower";}
else {
if (x > y){
cout<<"higher";}}
}
system("pause>nul");
return 0;
}
i cant see the get the initial if statement to work no matter what number i type in it would auto display the out of number range. also am i allowed to place the conditions like that soo close like if (x < 0)(x > 100);. also how do i make it soo it returns to the start of the program?

Answer 1

There is an error:
if (x < 0)(x > 100);
{
cout<<"out of number range";
}
Should be:
if (x < 0 || x > 100)
{
cout<<"out of number range";
}
You also need to work on your indentation; those if/else statements towards the bottom look dodgy (I cannot really tell due to the indentation).

Answer 2

Aside from writing if (x < 0 || x > 100) (and dropping the semicolon), you should be wary of comparing equality on floating point. I would red flag your line if (x == y){ if reviewing your code.
See Floating point comparison

Answer 3

nobody else is actually answering your second question: how to loop it, here you go:
int x;
cout << "Welcome to the guessing game\n";
do {
cout << "Please enter a number from 0 to 100: ";
cin >> x;
} while (x < 0 || x > 100);

Answer 4

You have written
if (x < 0)(x > 100);
{
cout<<"out of number range";
}
First remove the semi colon.
Second did you mean
if ((x < 0) || (x > 100))
{
cout<<"out of number range";
}

Answer 5

try this:
/*
if (x < 0)(x > 100);
{
cout<<"out of number range";
}
*/
if (x < 0 || x > 100)
{
cout<<"out of number range";
}

Answer 6

There are a few notable syntax errors:
if (x < 0)(x > 100);
{
cout<<"out of number range";
}
First of all, you can't just put two conditions side by side like that in C++ that I know of. You'd have to separate them with || for OR, or && for AND (in most cases - there are some others).
Also, you had a ; at the end of your if statement. I believe that doing this in C++ will result in some problems too.
Your final code should look like:
if ((x < 0) || (x > 100))
{
cout << "out of number range" << endl;
}
The << endl; part is optional. This adds a new line to your output, for more readability next time you write something.
Also, to loop your entire game repeatedly, I would use a do-while loop. You can learn about them here.