ARRAYSCPP.pptx

ARRAYSCPP.pptx

• 1.
  ARRAYS IN C++
• 2.
  ARRAYS: -An array isdefined as the collection of similar type of data items stored at contiguous memory locations. - Arrays are the derived data type in C++ programming language which can store the primitive type of data such as int, char, double, float, etc. -It also has the capability to store the collection of derived data types, such as pointers, structure, etc. -The array is the simplest data structure where each data element can be randomly accessed by using its index number.
• 4.
  ONE DIMENSIONALARRAY: SYNTAX: Data_Type array_name[array_size];
• 6.
  EXAMPLE int marks[9]={40,55,63,17,22,68,89,97,89};
• 7.
  MEMORY SIZE OFARRAY=TOTAL NO OF ELEMENTS IN ARRAY*DATATYPE SIZE
• 8.
  // Array declarationby specifying size int arr1[10]; // declare an array of user specified size int n = 10; int arr2[n]; // Array declaration by initializing elements int arr[] = { 10, 20, 30, 40}; // Array declaration by specifying size and initializing elements int arr[6] = { 10, 20, 30, 40 };
• 9.
  int marks[5];//declaration ofarray INITIALIZATION OF ARRAY FIRST METHOD: marks[0]=80; marks[1]=60; marks[2]=70; marks[3]=85; marks[4]=75; SECOND METHOD: for(i=0;i<5;i++) { cin>>marks[i]; }
• 10.
  EXAMPLE OF 1D ARRAY int main() { int values[5]; // taking input and storing it in an array for(int i = 0; i < 5; ++i) { cin>>values[i]; } // printing elements of an array for(int i = 0; i < 5; ++i) { cout<<values[i]; } }
• 11.
  MULTI DIMENSIONALARRAYS • Arraysof arrays.(ie) an array containing one or more arrays. SYNTAX: Data_Type array_name[1st dimension][2nd dimension][]..[Nth dimension] ;
• 12.
  TWO DIMENSIONAL ARRAYS: Data_Typearray_name [][]; int a[n][n];
• 13.
  TWO DIMENSIONAL ARRAY intx[3][3];
• 14.
  Initializing Two –Dimensional Arrays: First Method: int x[3][4] = {0, 1 ,2 ,3 ,4 , 5 , 6 , 7 , 8 , 9 , 10 , 11} Second Method: int x[3][4] = {{0,1,2,3}, {4,5,6,7}, {8,9,10,11}}; Third Method: int x[3][4]; for(int i = 0; i < 3; i++){ for(int j = 0; j < 4; j++){ cin>>x[i][j]; } }
• 15.
  EXAMPLE OF 2DARRAY int main() { int disp[2][3]; int i, j; for(i=0; i<2; i++) { for(j=0;j<3;j++) { cout<<"Enter values for array”; cin>>disp[i][j]; }} cout<<"Two Dimensional array elements:n"; for(i=0; i<2; i++) { for(j=0;j<3;j++) { cout<< disp[i][j]; } } }
• 16.
  3D Arrays Example: int arr[3][3][3]; 3tables each with 3 rows and 3 columns
• 17.
  JAGGED ARRAYS - Raggedarrays - Array of arrays such that member arrays can be of different sizes. - 2-D arrays with variable number of columns in each row. int s[4][]; s[0]={1}; s[1]={2,3}; s[2]={4,5,6}; s[3]={7,8,9,10};
• 18.
  arr[][] = {{0, 1, 2}, {6, 4}, {1, 7, 6, 8, 9}, {5} };