Chandan
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Arrays allow storing multiple values of the same data type in adjacent memory locations. There are one-dimensional arrays, which store elements in a single list, and multi-dimensional arrays like two-dimensional arrays which store elements in a table-like structure. Arrays can be declared and initialized, with elements accessed via indices and operations like loops. The memory address of elements depends on whether the array is laid out in row-major or column-major order.
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![USE Can store multiple values of same type Values are stored in adjacent memory locations [ ] is the operator used](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-3-320.jpg)
![Example Int students[5] Allocate following memory Fifth element Fourth element Third element Second element First element](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-4-320.jpg)
![Types of Arrays One Dimensional Arrays Two Dimensional Arrays Multi Dimensional Arrays 3D Array, 4D Arrays etc. A[0] A[1] A[2] A[3] A[4] A[5] A[0][0] A[0][1] A[0][2] A[0][3] A[0][4] A[1][0] A[1][1] A[1][2] A[1][3] A[1][4 A[2][1] A[2][2] A[2][3] A[2][3] A[2][4]](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-5-320.jpg)
![Declaration of Array One Dimensional Arrays int A[10]; float B[20]; char C[20]; Two Dimensional Arrays int X[5][5]; char Y[5][25];](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-6-320.jpg)
![Initialization of the Array int A[5]= {1,2,3,4,5}; int ARR[ ] = {1,2,3,4,5,6}; char B[20]=Rudrapur; float C[5]={2.4,3.5,1.5}; int D[2][3]={{1,2}, {3,4}, {5,6}};](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-7-320.jpg)
![Accessing Array Elements In C++ first element of the array is always at zero position. A[0] A[1] A[2] A[3] A[4] A[5]](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-8-320.jpg)
![Sample Program on 1-D Array #include<iostream.h> void main() { int A[10],i; for(i=0;i<10;i++) { cout<<Enter a number: ; cin>A[i]; } cout<<\n Array Contents\n; for(i=0;i<10;i++) { cout<<A[i]<< ; } }](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-9-320.jpg)
![Sample Program on 2-D Array #include<iostream.h> void main() { int A[3][4],i,j; for(i=0;i<20;i++) for(j=0j<4;j++) { cout<<Enter a number: ; cin>A[i]; } cout<<\n Array Contents\n; for(i=0;i<10;i++) { for(j=0j<4;j++) cout<<A[i]<< ; cout<<endl; } }](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-10-320.jpg)
![Address Calculation in Row Major A[i][j]= B + [i*n + j] Where B=Base address of the array n = Total column of the array i = Row number of desired row j = Column number of desired row](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-12-320.jpg)
![Address in Column Major A[i][j]= B + [i + j*m] Where B=Base address of the array m = Total rows of the array i = Row number of desired row j = Column number of desired row](https://image.slidesharecdn.com/chandan-120211002706-phpapp01/85/Chandan-13-320.jpg)
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- 1. Arrays Designed By:Chandan deep singh College Guru nanak engg college, ludhiana, Punjab
- 2. Definition Array is a collection of variables of same data type with a common name
- 3. USE Can store multiple values of same type Values are stored in adjacent memory locations [ ] is the operator used
- 4. Example Int students[5] Allocate following memory Fifth element Fourth element Third element Second element First element
- 5. Types of Arrays One Dimensional Arrays Two Dimensional Arrays Multi Dimensional Arrays 3D Array, 4D Arrays etc. A[0] A[1] A[2] A[3] A[4] A[5] A[0][0] A[0][1] A[0][2] A[0][3] A[0][4] A[1][0] A[1][1] A[1][2] A[1][3] A[1][4 A[2][1] A[2][2] A[2][3] A[2][3] A[2][4]
- 6. Declaration of Array One Dimensional Arrays int A[10]; float B[20]; char C[20]; Two Dimensional Arrays int X[5][5]; char Y[5][25];
- 7. Initialization of the Array int A[5]= {1,2,3,4,5}; int ARR[ ] = {1,2,3,4,5,6}; char B[20]=Rudrapur; float C[5]={2.4,3.5,1.5}; int D[2][3]={{1,2}, {3,4}, {5,6}};
- 8. Accessing Array Elements In C++ first element of the array is always at zero position. A[0] A[1] A[2] A[3] A[4] A[5]
- 9. Sample Program on 1-D Array #include<iostream.h> void main() { int A[10],i; for(i=0;i<10;i++) { cout<<Enter a number: ; cin>A[i]; } cout<<\n Array Contents\n; for(i=0;i<10;i++) { cout<<A[i]<< ; } }
- 10. Sample Program on 2-D Array #include<iostream.h> void main() { int A[3][4],i,j; for(i=0;i<20;i++) for(j=0j<4;j++) { cout<<Enter a number: ; cin>A[i]; } cout<<\n Array Contents\n; for(i=0;i<10;i++) { for(j=0j<4;j++) cout<<A[i]<< ; cout<<endl; } }
- 11. Address Calculation in 2D Arrays Row Major Column Major 0 1 2 3 4 0 1 2 3 4 5 Base Address : 1000 Address of Location X Address of Location Y Size of Each Element : 2 Bytes In Row Major : 1032 In Column Major : 1016 In Row Major : 1018 In Column Major : 1032 Y X
- 12. Address Calculation in Row Major A[i][j]= B + [i*n + j] Where B=Base address of the array n = Total column of the array i = Row number of desired row j = Column number of desired row
- 13. Address in Column Major A[i][j]= B + [i + j*m] Where B=Base address of the array m = Total rows of the array i = Row number of desired row j = Column number of desired row
- 14. THANKS FOR YOUR TIME