How to initialize the variable - c++

Question

hello i want to build a programme that finds even and odd number from given two numbers.
when i build it it says succeed
but still it says
warning C4700: uninitialized local variable 'number' used
when i debug it debug error appeared
how to solve this? and can anybody tell me the reason it happens?
thank you so much
below is the code
#include<stdio.h>
#include <iostream>
using namespace std;
int main(){
int number;
int firstNum,secondNum;
cout << "Enter the first number: ";
cin >> firstNum;
cout << "Enter the second number: ";
cin >> secondNum;
if(number % 2 !=0){
for(number = firstNum;number <= secondNum; number++)
cout << number<< " ";
cout << "Odd numbers in given range are: ";
cout << number<< " ";
}
else if(number % 2 ==0){
for(number = firstNum;number <= secondNum; number++)
printf("\nEven numbers in given range are: ");
cout << number << " ";
}
return 0;
}

Answer 1

The reason your program gives error is because you haven't initialized your variable number. I have corrected that. There were few other bugs too which would have given wrong output.I have corrected and reformatted your code a bit -
#include<stdio.h>
#include <iostream>
using namespace std;
int main(){
int number;
int firstNum,secondNum;
cout << "Enter the first number: ";
cin >> firstNum;
cout << "Enter the second number: ";
cin >> secondNum;
number=firstNum;
for(number = firstNum;number <= secondNum; number++)
cout << number<< " ";
//Following piece will print out all odd numbers
cout << "\nOdd numbers in given range are: ";
for(number = firstNum;number <= secondNum ; number++)
if(number&1)
cout<<number<<" ";
cout<<"\n";
//Following piece will print out all even numbers
cout << "Even numbers in given range are: ";
for(number = firstNum;number <= secondNum ; number++)
if(!(number&1))
cout<<number<<" ";
cout<<"\n";
return 0;
}
You are probably trying to print the odd numbers and even numbers in a given range. The above program does exactly that.
Hope this solves your question !