fibonacci numbers in c 2b 2b

1#include <iostream>
2using namespace std;
3
4int main(){
5	int a{0},b{1},count{},c{};
6	cin >> count;
7	for (int i = 0; i < count; ++i)
8	{
9		cout << a << endl;
10		c = b;
11		b = a + b;
12		a = c;
13	}
14}

1#include <iostream>
2using namespace std;
3
4int main ()
5{
6    int num1, num2, num3, input; 
7    num1 = 0;
8    num2 = 1;
9    cout << "How many nums in sequence do you want to see: "; 
10    cin >> input; 
11    cout << num1 << " " << num2 << " "; 
12
13    for(int i = 2; i < input; i++) // runs through every element but first two 
14    {
15        num3 = num1 + num2; 
16        cout << num3 << " "; 
17        num1 = num2; 
18        num2 = num3; 
19    }
20    
21    return 0;
22}

1#include<iostream>
2using namespace std;
3int main()
4{
5    int num,num1=0,num2=1,num3,i=0;
6    cout<<"enter the number num"<<endl;
7    cin>>num;
8    for(i=1;i<=num;i++)
9    {
10        num3=num1+num2;
11        num1=num2;
12        num2=num3;
13        cout<<num3<<endl;
14    }
15
16}
17

1#include <iostream>
2using namespace std;
3void main()
4{
5    int num,x=0,y=1,fib=0;
6    cin >> num;
7    if (num == 1)
8        cout << "0";
9    else if (num == 2)
10        cout << "0 1";
11    else
12    {
13        cout << "0 1 ";
14        for (size_t i = 0; i < num - 2; i++)
15        {
16            fib = x + y;
17            x = y;
18            y = fib;
19            cout << fib << " ";
20
21        }
22    }
23}

1#include <iostream>
2using namespace std;
3
4int main()
5{
6    int n, t1 = 0, t2 = 1, nextTerm = 0;
7
8    cout << "Enter the number of terms: ";
9    cin >> n;
10
11    cout << "Fibonacci Series: ";
12
13    for (int i = 1; i <= n; ++i)
14    {
15        // Prints the first two terms.
16        if(i == 1)
17        {
18            cout << " " << t1;
19            continue;
20        }
21        if(i == 2)
22        {
23            cout << t2 << " ";
24            continue;
25        }
26        nextTerm = t1 + t2;
27        t1 = t2;
28        t2 = nextTerm;
29        
30        cout << nextTerm << " ";
31    }
32    return 0;
33}
34