Maximum value of range of values in array (C++) - range

Question

The array ampVal has 25600 integers inside it. I need to find the maximum value of each set of 1024 values in the array and store it in another array. However I'm not getting this part to work it only gives 21 values and a random number '1348410436'. ampVal is a dynamic array.
#include<iostream>
#include<fstream>
#include<string>
#include<sstream>
using namespace std;
int main() {
ifstream miniProject;
int n = 0;
miniProject.open("C:\\Users\\Simeon Ramjit\\Desktop\\audioframes.txt");
if (!miniProject) {
cout << "File not found" << endl;
}
else {
cout<<"File Located ! :D \nCounting Lines in file..." << endl;
while (miniProject) {
string lines;
getline(miniProject, lines);
n++;
}
cout << "Number of lines in file are: " << n << endl;
miniProject.close();
}
int *frNum = new int[n];
int *bitNum = new int[n];
int *ampVal = new int[n];
for (int i = 0; i < n;i++){
frNum[i] = 0;
bitNum[i] = 0;
ampVal[i] = 0;
}
miniProject.open("C:\\Users\\Simeon Ramjit\\Desktop\\audioframes.txt");
if (!miniProject) {
cout << "File not found" << endl;
}
else {
int i = 0;
string frameNumber, bitNumber, amplitudeValue;
while (miniProject) {
(miniProject >> frameNumber >> bitNumber >> amplitudeValue);
stringstream(frameNumber) >> frNum[i];
stringstream(bitNumber) >> bitNum[i];
stringstream(amplitudeValue) >> ampVal[i];
i++;
}
}
miniProject.close();
int frameGroupStart = 0;
int frameGroupEnd = 1024;
int maxAmpVal = 0;
while (frameGroupEnd != 25600) {
for (int i = frameGroupStart; i < frameGroupEnd; i++) {
if (ampVal[i] >maxAmpVal) {
maxAmpVal = ampVal[i];
cout << maxAmpVal << endl;
}
}
frameGroupStart = frameGroupStart + 1024;
frameGroupEnd = frameGroupEnd + 1024;
}
getchar();
return 0;
}

Answer 1

I used an alternate approach and this gets the job done:
int bitGroupStart = 0;
int bitGroupEnd = 1024;
int arrayOfMaxAmpVal[25];
int frameNumMaxVal[25];
int maxAmpVal = 0;
for (int i = 0; i < 25; i++) {
for (int j = bitGroupStart; j < bitGroupEnd; j++) {
if (ampVal[j] > maxAmpVal) {
maxAmpVal = ampVal[j];
}
}
bitGroupStart = bitGroupStart + 1024;
bitGroupEnd = bitGroupEnd + 1024;
arrayOfMaxAmpVal[i] = maxAmpVal;
frameNumMaxVal[i] = i;
maxAmpVal = 0;
}