use of undeclared identifier 'data' C++ - c++

Question

"Write a function, named sums(), that has two input parameters; an array of floats; and an integer,
n, which is the number of values stored in the array. Compute the sum of the positive values in the array
and the sum of the negative values. Also count the number of values in each category. Return these four
answers through output reference parameters.
Write a main program that reads no more than 10 real numbers and stores them in an array. Stop reading numbers when a 0 is entered. Call the sums() function and print the answers it returns. Also compute and print the average values of the positive and negative sets."
#include <iostream>
using namespace std;
void sums(float data[], int count, float& posSum, int& posCnt, float& negSum, int& negCnt);
double input(double UserInput);
int main()
{
float data[10];
int count = 10 ;
double UserInput = 0;
float posSum=0.0, negSum=0.0; //sum of positives and negatives
int posCnt =0, negCnt=0; // count of postive and negatives
input(UserInput);
sums(data, count, posSum,posCnt, negSum, negCnt);
cout << "Positive sum: " << posSum << endl;
cout << "Positive count:" << posCnt << endl;
cout << "Negative sum: " << negSum << endl;
cout << "Negative count:" << negCnt << endl;
return 0;
}
double input(double UserInput) {
for(int i = 0; i < 10; i++){
cout << "Enter a real number or '0' to stop: " ;
cin >> UserInput;
if(UserInput == 0)break;
data[i] = UserInput;
}
return UserInput;
}
void sums(float data[], int count, float& posSum, int& posCnt, float& negSum, int& negCnt){
int i;
for(i = 0; i < count; i++){
if(data[i] > 0){
posCnt += 1;
posSum += data[i];
}
else{
negCnt += 1;
negSum += data[i];
}
}
}
It gives me an error when trying to compile it saying "use of undeclared identifier 'data'" on line 32 in the input function.

Answer 1

It is because the data is not declared in the function input, you should use a float pointer.
void input(float *data)
{
float UserInput;
for (int i = 0; i < 10; i++)
{
cout << "Enter a real number or '0' to stop: ";
cin >> UserInput;
if (UserInput == 0)break;
data[i] = UserInput;
}
return;
}
int main()
{
float *data;
data = (float*)malloc(10 * sizeof(float));
input(data);
cout << data[0];
free(data);
system("pause");
return 0;
}
This should be an accurate example. Good Luck with your following homework.