C++ :: How To Get Program Recognise User Input

I need the program to do a calculation after the user inputs 10 numbers . This is what I have tried so far:

int count;
float value, high,low, sum,average;
sum=0;
count=0;

input:
printf("Enter a number (enter negative value to finish program):
");
scanf_s("%f",&value);

[Code] ....

output:
average=sum/count;
if(count==10) {
printf("total values :%d
",count);
printf("The Highest value :%f
Lowest Value: %f
",high,low);
printf("The average of the values is:%f
",average);
}