Help with making run program be able to enter decimal numbers

[NqR2y60M]

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[sujitnag]

u define n is int( int n) in 2ndline of main.
but 1.0 is float, so error.

[NqR2y60M]

So what would I do next?

[newbiee999]

You need to replace your line number 7 with float.
float n;

You defined 'n' as an integer and an int can not have decimal spaces. That is why your program was blowing up.
A float can have a decimal point so if you declare 'n' as a float, the compiler knows that it has to accept decimals.

[NqR2y60M]

I have a problem with line 10 now
says "a" was not declared

#include <iostream>
#include <math.h>
using namespace std;
int main()
{
   float sum=0, avg=0, var=0, dev=0;
    float n;
    cout << "How many numbers?  ";
    cin >> n;
    int a[n];
    for (int i=0; i<n; i++) {
   		cout << "Enter a number: ";
   		cin >> a[i];
   		sum += a[i];
    }
    avg = sum / n;
    for (int i=0; i<n; i++) {
    var += pow((a[i]-avg),2);  
    }
    var = var/n;
    dev = sqrt(var);
    cout << "You have entered the following" << endl;
    for (int i=0; i<n; i++) {
    	cout << a[i] << endl;  
    }
   cout << endl << "The Sum is: "             << sum;
   cout << endl << "The average is: "          << avg;
   cout << endl << "Variance is: "            << var;
   cout << endl << "Standard Deviation is: "    << dev << endl;
   char c; cin >> c;
   return 0;
}

[shadowmouse]

You can't have an array of float length. I'm pretty sure you can't have an array of variable length anyway unless you're going to use STL containers.