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#### Cro

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5 Posts
Discussion Starter
hi guys. im really having probs with arrays. Basically i open an input file like:

Code:
``````ifstream infile;

infile.open("A:\\students.txt");``````
now the file contains different int numbers...like:

76,89,150,135,200,76,12,100,150,28,178,189,167,200,175,150,87,99,129,149,176,200,87,35,157,189

now what i need to do is to put all those in an array...and then determine the number of students having scroes in each of the following ranges:

0-24, 25-49, 50-74, 75-99, 100-124, 125-149, 150-174, and 175-200.

it should then display the results like:

------------COUNTS(the total number)
0-24 ------- 1
25-49-------- 2
50-74 --------0
.. ----------- .
. ----------- .
.. ----------- .
.

please if someone could help me.... thanks!

ive tried some code, but im really stuck:,, this is what ive done:

Code:
``````int list[26];
int z;

infile >> list[26];
while(infile)
{
///for(z = 0; z < 26; z++)
//{

if(list[z] > 0 && list[z] < 25)
{
list[z]++;
sum = sum + list[z];

}
infile >> list[26];
cout << sum;
}``````

#### Cwwoods

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4 Posts
Binary Search or Bubble Sort?

Have you tried something like this?

Example of Binary Seach.....

int binarysearch (int array[], int size, int searchKey)

{

int low = 0, middle, high;

high = -1;

while (low <= high);

{

middle = (low + high) / 2;

if (searchKey == array [middle])
return middle;

else if (searchKey < array [middle])
high = middle -1;

else
low = middle + 1;

}

}

Does this help? Once it finds the values in the array you should be able to sort them with some more code.

#### mgoldb2

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604 Posts
PHP:
``````#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

int main()
{
int n[26];

ifstream input;
input.open("input.dat");

if(input.fail( ))
{
cout << "Cannot open file"<<endl;
return 1;
}

int x=0;

while(!input.eof())
{
input>> n[x];
x++;
}

input.close( );

int y=25;
int size=0;
cout<<setw(3)<<"Range"<<setw(9)<<"count"<<endl<<endl;
for(int a=0;a<8;a++)
{
int z=0;
while(z<x)
{
if(n[z]<y && n[z]>y-25)
{
size++;
}

z++;

}

cout<<setw(3)<<y-25<<setw(2)<<"-"<<setw(3)<<y<<setw(3)<<size<<endl;
size=0;
y=y+25;
}

return 0;
}``````
This will work. basically what it does it save each value in the file into a array. then it searchers the array 8 times each time looking for a different one of the ranges you needed then displays how many time it found a number in that range.

#### Cro

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5 Posts
Discussion Starter
thanks for all the help very much appreciated!

#### Andrew'smom

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2 Posts
Hi I am struggling with a similar problem...but it is 5 years later...anybody still reading this?
Thanks.
Andrew'smom

#### dm01

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##### TSF Team, Emeritus
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2,367 Posts
Generally, it is a good idea to create a new thread for a separate issue; especially if the original thread is more than a year old.

This thread is closed to further replies.

Thank you.

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