comparing elements of an array

[quest2learn]

Can someone help me to read how many times an element appeared in an array of numbers, for example int array[]= {1,1,2,3,4,1,3,2,9,8,7}
How can i display how many times each number appeared in the array of numbers.
Thanks....!

[Anmol444]

Use a range based for loop. After every time it encounters the literal you want to know how many times appeared use a if to increment a variable named count. Here is an example

#include <iostream>
using namespace std;
int main()
{
int count = 0;
int array[]= {1,1,2,3,4,1,3,2,9,8,7};
for (int i:array)
{if (i == 1) ++count;}
cout<<"Number 1 appeared "<<count<<" times in the array"<<endl;
return 0;
}

[Anmol444]

This one allows you to choose

#include <iostream>
using namespace std;
int main()
{
int num, count = 0;
int array[]= {1,1,2,3,4,1,3,2,9,8,7};
cout<<"Which number would you like to know about how many times it appeared?"<<endl;
cin>>num;
for (int i:array)
{if (i == num) ++count;}
cout<<"Number "<<num<<" appeared "<<count<<" times in the array"<<endl;
return 0;
}

[The illusionist mirage]

@Anmol444 using a range based loop

When i run that code in Code::Blocks, it says "error: range based-for-loops are not allowed in C++98 mode". Can you please tell what's wrong?

[Anmol444]

Range based for loops were a addition in c++ 11. It seems like your compiler settings are changed. Google how to change code::blocks to c++ 11 mode.

Here check this out: http://forums.codeblocks.org/index.php?topic=15536.0
http://stackoverflow.com/questions/6528595/how-can-i-get-codeblocks-to-compile-with-std-c0x-with-gcc
Or download Visual studio Express 2012

[Cubbi]

C++ has a function called count(), which does this:

#include <iostream>
#include <algorithm>
#include <iterator>
using namespace std;
int main()
{
    int array[]= {1,1,2,3,4,1,3,2,9,8,7};
    int num = 1;
    unsigned int cnt = count(begin(array), end(array), num);
    cout << "The number " << num << " appears " << cnt << " times\n";
}

online demo: http://ideone.com/zztUtO

(if your compiler is too old to support begin/end for arrays, you can call count as count(array, array + 11, num);, where 11 is the number of elements in the array)

[Anmol444]

This should solve your problem:

Look in Project's "Build" properties, you'll see configurations tab for the compiler. Then select all the configurations, go in the list of features and select "C++0x".

[The illusionist mirage]

@Anmol

So the codes in codeblocks and VS 2012 are the same?Thanks once again.

[Anmol444]

No problem.

[quest2learn]

@Anmol
thanks... but if you dont mind another question, what if you have to read n compare the elements of the array from an infile?

[Anmol444]

Not quite sure on how to do that. Sorry