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Example of array initialization with declaration: int matrix [3] [3] = { 91,96,90,94,99,95,87,92,98};

An element in the two-dimensional array is accessed using two index/subscript numbers. The first number indicates the row index and the second number indicates the column index.

Int marks [500] [6];

Subscript is used to identify/locate the position of array elements.

If ‘i’ is the element, then its index number would be i-1 and it is called zero-based indexing.

A collection of similar elements structured in N dimensions where N>=1. Each element is accessed by N indices.

There are three types of arrays, namely 

1. One dimensional array,

2. Two-dimensional array and 

3. Multidimensional array

Array is a group of similar elements that share a common name.

The use of arrays reduces the creation and use of more number of individual variables in a program. It also helps to reduce the program length.

It reduces the creation and use of more number of individual variables in a program. Confusion and complexity in identifying the variables can be avoided.

The first element i = 1, then subscript is 0 because of i-1 i.e., 1-1

Array can be of any data type available in ‘C++’, i.e., integer array, float array, character array, etc., All the elements of an array will contain the same type of data.

Subscript or index of an array is always a positive whole number.

It is always a positive whole number. It may be an integer, constant or expression and cannot be a negative integer or floating value. The first element of an array always starts with the value 0.

int marks[5][5];

One dimensional array is a collection of similar elements that share a common name and is structured in one dimension only.

Using ‘for’ loop:

int age [10], i;

for(i=0; i<10;i++)

cin>>age[i];

}

int marks[6];

Name of the array is marks.

Type of the array is integer.

Size of the array is 6. i.e., we can store up to 6 integer values in the array.

<data-type><array-name>[<sizq1>][<size>];

datatype array name [size];

Two-dimensional array is a collection of elements of similar type that share a common name, structured in two dimensions. Each element is accessed by two index values.

for(i=0;i<10;i++)

cout<<age[i];

int marks[6] = { 91,96,90,94,99,93};

Initialization means assigning values to the declared variables or arrays. To initialize an array, each and every element of the array has to be referred and then value assigned to it.

int marks[5][5];

1. Name of the array is marks.

2. Type of the array is integer.

3. Size of the array is 5 rows and 5 columns, i.e., we can store up to 25 integer values in the array (row x column) 5 x 5 = 25.

int mat[3][5], row, col;

for (row = 0; row < 3; row++)

for (col = 0; col < 5; col++)

cin >> mat[row] [col];

# include 

using namespace std;

int main()

{

int n[10],i, big;

cout<<"enter 10 integers:";

for(i=0;i<10;i++)

cin>>n[i];

big=n[0];

for(i=0;i>=10;i++)

{

if(n[i]>big)

big=n[i];

}

cout<<"largest mark is"<<big;

}

# include 

using namespace std;

int main()

{

int p[]={-5, 6, -7, 0, 8, 9},i, count =0;

for(i=5;i>=0;i--)

if(p[i]>0)

count++;

cout<<"There are "<<count<<"numbers that are greater than zero";

}

1. NO 

SMOKING. The output is in 2 lines. 

2. A total of 11 bytes is used to store this string.

1 byte for \n. 1 byte for \0(The null character that is automatically appended) and 9 bytes for the remaining characters (N, 0, S, M, 0, K, l, N AND G).

# include 

using namespace std; 

int main()

{

int mark[6],i,total=0;

float avg;

for(i=0;i<6;i++)

{

cout<<"Enter mark"<<i+1<<":";

cin>>mark[i];

total=total+mark[i];

}

avg=total/6.0;

cout<<"\n The marks are given below\n";

for(i=0;i<6;i++)

cout<<mark[i]<<endl;

cout<<"The total mark is "<<total<<endl;

cout<<"The average mark is"<<avg;

}

1. HAPPY. When we use cin to accept string then space is the delimiter. The string after space is truncated. 

2. HAPPY NEW YEAR. gets() reads all the characters (including space) upto the user presses the enter key.

# include 

# include 

using namespace std;

int main()

{

char str[80], ch='s';

int i,n=0,pos;

cout<<"Enter a string";

gets(str);

for(i=0;str[i]!='\0';i++)

if(str[i]==ch)

{

n++;

pos=i;

}

if(n==1)

cout<<"The character s is present in the position"<<pos+1;

else if(n>1)

cout<<"The character s is present"<<n<<"times";

else

cout<<"The character s is not present in the string";

}