C++ cin data limit? - c++

Question

So I took a C++ class in High School, but haven't done it in years, so I'm basically new. So I am wondering if there is a limit to the amount of cins you can do. It allows me to input 7 and then skips all the other inputs to go to the end. My guess is that there's a data limit. Is this correct?
#include <iostream>
using namespace std;
int main() {
int time1;
int time2;
int time3;
int time4;
int time5;
int time6;
int time7;
int time8;
int time9;
int time10;
cout<<"enter number";
cin>>time1;
cout<<"enter number";
cin>>time2;
cout<<"enter number 1";
cin>>time3;
cout<<"enter number 1";
cin>>time4;
cout<<"enter number 1";
cin>>time5;
cout<<"enter number 1";
cin>>time6;
cout<<"enter number 1";
cin>>time7;
cout<<"enter number 1";
cin>>time8;
cout<<"enter number 1";
cin>>time9;
cout<<"enter number 1";
cin>>time10;
cout<<"the end?";
}

Answer 1

You can use cins unlimited and you need to use loops. Here I provided example of fillind array buy cin.
#include <iosteam>
using namespace std;
int main(){
cout<<"Enter number of cins\n";
int n;
cin>>n;
int a[n];
for(int i=0;i<n;i++){
cout<<"Enter "<<i<<" number\n";
cin>>a[i];
}
}

Answer 2

Your code should work fine if you only enter numbers. There is no limit to the amount of cins you can do. My guess is that you enter something that isn't a number, e.g. a string. When that happens cin's error flag is set and future attempts to get input will fail.
What you can do is add some input validation if you want. A simple if statement will do:
int num{0};
if (cin >> num)
{
....
}
If the input is not valid, i.e. the if condition is false, you need to clear the error:
cin.clear();
and discard everything remaining in the input buffer and newline:
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
You could use a std::vector to store the numbers instead of separate integer variables and use a do...while loop. Putting this all together your code could look like this:
#include <iostream>
#include <vector>
#include <limits>
int main()
{
std::vector<int> nums;
int n{0};
std::cout << "Enter total number to input" << std::endl;
std::cin >> n;
int i{0};
do
{
std::cout << "Enter number " << i+1 << std::endl;
int num{0};
if (std::cin >> num)
{
nums.push_back(num);
++i;
}
else
{
std::cin.clear();
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
std::cout << "Invalid input" << std::endl;
}
} while (i < n);
}
Note that I'm not using namespace std in my code. That's considered bad practice.