C++ Program To locate a no. in the list

//To locate a number in a list
#include <iostream>
using namespace std;
int main()
	int i,n;
	double x;
	cout<<"Enter the size of the list"<<endl;
	cout<<"Enter the elements of the list\n";
	double a[n];
	for (i=0;i<n;i++)
	cout<<"Which no. do you wish to find?\n";
		if (a[i]==x)
		cout<<"The no. is at "<<i<<"th position in the list.\n";
		cout<<"Sorry, the no. can't be found\n";
	return 0;

PhD researcher at Friedrich-Schiller University Jena, Germany. I'm a physicist specializing in computational material science. I write efficient codes for simulating light-matter interactions at atomic scales. I like to develop Physics, DFT and Machine Learning related apps and softwares from time to time. Can code in most of the popular languages. Like to share my knowledge in Physics and applications using this Blog and a YouTube channel.
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