invalid conversion from int to int* - c++

Question

I am getting the error:
Invalid conversion from int to int*.
I have not created any int* (I think) and when I change the offending lines to be int*, There are no build errors but the program crashes upon launch.
Here is my code:
//Main:
int main(){
//Varibales:
Random randomInt;
clock_t start;
clock_t End;
double duration;
double clocksPerSec;
int result;
int arraySize;
//Repeat 100 times:
for(int i=1; i<=100; i++){
//Set array size:
arraySize = i*500;
//Create the array:
int testArray[arraySize];
//For the array size:
for(int j=0; j<arraySize; j++){
//Add random number to array:
testArray[j] = randomInt.randomInteger(1, 10000);
}
//Run the test:
start = clock();
result = algorithmTest(testArray[arraySize], arraySize);
End = clock();
//Calculate execution time:
duration = End - start;
clocksPerSec = duration/CLOCKS_PER_SEC;
//Display the result:
cout << "The median is: ";
cout << result << endl;
cout << "Exection time was: ";
cout << clocksPerSec;
cout << "s\n" << endl;
}
//Return 0:
return 0;
}
It seams to be throwing the error when i call algorithmTest(); Here it is:
//First Test:
int algorithmTest(int testArray[], int Size){
//Declare variables:
int k = Size/2;
int numSmaller;
int numEqual;
//For every element in the array:
for(int i=0; i<Size; i++){
//Set varibales to 0:
numSmaller = 0;
numEqual = 0;
//For every element in the array:
for(int j=0; j<Size; j++){
//If j is less than i:
if(testArray[j] < testArray[i]){
//Increment numSmaller:
numSmaller++;
//Else if j is equal to i:
}else if(testArray[j] == testArray[i]){
//Increment numEqual:
numEqual++;
}
}
//Determine if the median was found:
if(numSmaller < k && k <= (numSmaller + numEqual)){
//Retrun the medain:
return testArray[i];
}
}
//Return 0:
return 0;
}

Answer 1

result = algorithmTest(testArray[arraySize], arraySize);
should be
result = algorithmTest(testArray, arraySize);
Your function int algorithmTest(int testArray[], int Size) takes an int[] as first argument, while you pass a testArray[arraySize], where [i] operator means fetch the value at ith element of testArray, which is an int. Therefore you encounter that error.
In order to clarify something, the [...] in the line int testArray[arraySize]; is different from the [...] in the line result = algorithmTest(testArray[arraySize], arraySize);: first one is for indicating array's size, while the second one is for accessing the element.

Answer 2

Look at the definition of AlgorithmTest. You require an int[] (also known as int*) as first parameter, but when you call it you give it an actual int