Difference between revisions of "C-and-C++/C3/Arrays/English"

What is an array.

Declaration of an array.

Initialization of an array.

We will do this with the help of an example.

We will also explain some common errors and their solutions.

Ubuntu Operating System version 11.04,

gcc and g++ Compiler version 4.6.1 on Ubuntu.

Array is the collection of data or elements of same data-type.

Array index starts from 0.

The first element is stored at index 0.

eg. pen[5];

Here, we are declaring a character array which contains 5 elements.

pen[0] to pen[4].

There are three types of arrays:

1. Single dimensional array.
2. Two dimensional array.
3. Multi-dimensional array.

We will be discussing single dimensional array in this tutorial.

The Syntax for this is:

data-type array-name[size];

eg. char star[5];

The Syntax for this is:

data-type array-name[size]={values};

eg. int star[3]={1,2,3};

I have already typed the program on the editor.

So, I will open it.

Let me explain the program.

#include <stdio.h>

int main()

int star[3]={1,2,3};

int sum;

sum = star[0] + star[1] + star[2];

printf("The sum is %d\n",sum);

return 0;

Type

gcc array.c -o arr

./arr

gcc array.c -o arr

To execute type,

./arr

Output

The sum is 6.

int star[3]=1,2,3;

Let us compile as before.

Let us execute as before.

Error

Invalid initializer and Expected identifier or '(' before numeric constant.

Click on Save as option

Click on Save as option,

Save the file with .cpp extension.

iostream

using namespace std;

cout <<

g++ array.cpp -o arr

Type

./arr

g++ array.cpp -o arr

To execute

./arr

Output

The sum is 6.

Type:

star[1] + star[2] + star[3];

We type star[1] + star[2] + star[3];

Come back to the terminal.

Output

The sum is ....

We get an unexected output.

This is because array index starts from 0.

star[1]

Here the index starts from 1

Hence it is giving an error.

Arrays.

To declare Single Dimensional Array.

To initialize Single Dimensional Array.

eg. int star[3]={1,2,3}

Write a program to calculate the difference of the elements stored in an array.

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