Welcome to your C++ Level 3
1.
What is the error in this code?
int main() {
int x;
cout << "The value of x is " << x;
return 0;
}
2.
What is the error in this code?
```cpp
int main() {
int x = 10;
x++;
x += 5;
return 0;
}
3.
What is the error in this code?
```cpp
int main() {
int x;
int y = 0;
int z = x / y;
return 0;
}
4.
What is the error in this code?
```cpp
int main() {
int arr[5];
for (int i = 0; i <= 5; i++) {
arr[i] = i;
}
return 0;
}
5.
What is the error in this code?
```cpp
int main() {
int* ptr;
*ptr = 42;
return 0;
}
6.
What is the error in this code?
```cpp
int main() {
int x = 5;
if (x == 5) {
int x = 10;
}
cout << "x is " << x;
return 0;
}
7.
What is the error in this code?
```cpp
int main() {
int x;
cin >> x;
if (x < 0)
cout << "x is negative";
else if (x > 0)
cout << "x is positive";
return 0;
}
8.
What is the error in this code?
```cpp
int main() {
int x = 5;
int y = 0;
int z = x / y;
return 0;
}
9.
What is the error in this code?
```cpp
int main() {
int* ptr;
int x = *ptr;
return 0;
}
10.
What is the error in this code?
```cpp
int main() {
int x = 5;
int* ptr = &x;
delete ptr;
return 0;
}
11.
What is the error in this code?
```cpp
int main() {
char str[] = "Hello, world!";
str[0] = 'h';
cout << str;
return 0;
}
12.
What is the error in this code?
```cpp
int main() {
int x = 10;
int& ref = x;
int y = ref;
cout << "x is " << x << ", y is " << y;
return 0;
}
13.
What is the error in this code?
```cpp
int main() {
int x = 5;
int* ptr = &x;
int* another_ptr = ptr;
delete ptr;
cout << *another_ptr;
return 0;
}
14.
What is the error in this code?
```cpp
int main() {
int arr[5];
arr[5] = 42;
return 0;
}
15.
What is the error in this code?
```cpp
int main() {
int x = 5;
int* ptr = &x;
*ptr = 10;
cout << "x is " << x;
return 0;
}
16.
What is the error in this code?
```cpp
int main() {
int x = 5;
int& ref = x;
int* ptr = &ref;
*ptr = 42;
cout << "x is " << x;
return 0;
}
17.
What is the error in this code?
```cpp
int main() {
int x;
cin >> x;
if (x < 0) {
cout << "x is negative" << endl;
}
else {
cout << "x is positive" << endl;
}
cout << "x is " << x;
return 0;
}
18.
What is the error in this code?
```cpp
int main() {
int x = 5;
int y = 10;
int z = x / y;
cout << "z is " << z;
return 0;
}
19.
What is the error in this code?
```cpp
int main() {
int* ptr = new int;
delete ptr;
int x = *ptr;
return 0;
}
20.
What is the error in this code?
```cpp
int main() {
int arr[5];
arr[5] = 42;
cout << arr[5];
return 0;
}
21.
What is the error in this code?
```cpp
int main() {
int x = 5;
int* ptr = &x;
int y = ptr;
cout << "x is " << x << ", y is " << y;
return 0;
}
22.
What is the error in this code?
```cpp
int main() {
int x = 5;
int* ptr = &x;
cout << "x is " << *ptr << ", y is " << *ptr2;
return 0;
}
23.
What is the error in this code?
```cpp
int main() {
int x = 5;
int& ref = x;
int y = ref;
ref = 10;
cout << "x is " << x;
return 0;
}
24.
What is the error in this code?
```cpp
int main() {
int x = 5;
int* ptr = &x;
*ptr = 10;
cout << "x is " << x;
delete ptr;
return 0;
}
25.
What is the error in this code?
```cpp
int main() {
int x = 5;
int y = 10;
int& ref = x;
ref = y;
cout << "x is " << x;
return 0;
}
26.
What is the error in this code?
```cpp
int main() {
int x = 5;
int& ref = x;
int* ptr = &ref;
int y = *ptr;
cout << "x is " << x << ", y is " << y;
return 0;
}
27.
What is the error in this code?
```cpp
int main() {
int x = 5;
int y = 10;
int* ptr = &x;
*ptr = y;
cout << "x is " << x;
return 0;
}
28.
What is the error in this code?
```cpp
int main() {
int x = 5;
int& ref = x;
int* ptr = &x;
ref = 10;
cout << "x is " << *ptr;
return 0;
}
29.
What is the error in this code?
```cpp
int main() {
int x = 5;
int* ptr = &x;
delete ptr;
cout << "x is " << x;
return 0;
}
30.
What is the error in this code?
```cpp
int main() {
int x = 5;
int* ptr = &x;
int* another_ptr = ptr;
delete ptr;
cout << "x is " << *another_ptr;
return 0;
}
