C++ few beginner errors - c++

Question

Not very good at debugging yet but I'm getting a few errors. A few expected '(' ')' and ';'
Also 'else' without a previous 'if', no match for 'operator>>' in cout
I know this is easy, but still trying to get my foot in the door. Thanks :)
#include <iostream>
#include <cstdlib>
using namespace std;
int main() // guess number game
{
int x;
cout >> "Please enter a number\n";
getline(cin x);
int y = rand();
while x != y
{
if x < y;
cout >> "Go higher";
else;
cout >> "Go lower";
}
}

Answer 1

cout >> "Please enter a number\n";
This is wrong, std::ostreams only provide the operator<< to insert formatted data. Use cout << "Please enter a number\n"; instead.
getline(cin x);
First, you're missing a ,, since getline needs two or three arguments. But since x is an integer and not a std::string it is still wrong. Think about it - can you store a text line inside of an integer? Use cin >> x instead.
int y = rand();
While this doesn't seem wrong there's a logical error. rand() is a pseudo random number generator. It uses a seed as start value and some kind of algorithm (a*m + b). Thus you have to specify a start value, also called seed. You can specify this by using srand(). The same seed will result in the same order of numbers, so use something like srand(time(0)).
while x != y
if x < y;
Use parenthesis. And drop the additional ;. A stray semicolon ; in your program resembles the empty expression.
EDIT: Working code:
#include <iostream>
#include <cstdlib>
#include <ctime>
int main(){
int x;
int y;
srand(time(0));
y = rand();
std::cout << "Please enter a number: ";
do{
if(std::cin >> x){
if(x < y)
std::cout << "Go higher: ";
if(x > y)
std::cout << "Go lower: ";
}
else{
// If the extraction fails, `std::cin` will evaluate to false
std::cout << "That wasn't a number, try again: ";
std::cin.clear(); // Clear the fail bits
}
}while(x != y);
std::cout << "Congratulations, you guessed my number :)";
return 0;
}

Answer 2

Try this:
void main()
{
int x;
cout << "Please enter a number\n";
getline(cin, x);
int y = rand();
while(x != y)
{
if(x < y)
cout << "Go higher";
else
cout << "Go lower";
}
}

Answer 3

Not overly familiar with C++ but i'm pretty sure the while/if should look something like this
while (x != y)
{
if (x < y)
cout << "Go higher";
else
cout << "Go lower";
}
the conditions of both if and while loops should be nested with parenthesis.

Answer 4

everything you listed above are syntax errors. This can be easily fixed by reading up on the syntax of c++
http://www.cs.duke.edu/csed/tapestry/howtoa.pdf
it should look more like this:
while (x != y)
{
if (x < y)
cout >> "Go higher";
else
cout >> "Go lower";
}

Answer 5

Let's look at all the errors:
#include <iostream>
#include <cstdlib>
using namespace std;
int main() // guess number game
{
int x;
cout >> "Please enter a number\n"; // should be `cout <<` cin uses >>
getline(cin x); // incorrect number of arguments should be 2 or 3 plus x is an int not string could use cin instead
int y = rand();
while x != y // error condition checks should be parentheses like (x != y)
{
if x < y; // error condition should be parentheses also by adding a semicolon here you terminate the statement
cout >> "Go higher";
else; // technically not an error but unintended code is executed cout >> "Go higher" is always executed because of the semi colon ;
cout >> "Go lower";
}
// no return of value, you declared main to return an int so you should
}
Try this:
#include <iostream>
#include <cstdlib>
using namespace std;
int main() // guess number game
{
int x;
cout << "Please enter a number\n";
cin >> x;
int y = rand();
while (x != y)
{
if (x < y)
cout >> "Go higher";
else
cout >> "Go lower";
}
return 0;
}