The document introduces arrays, which are a collection of similar data items stored under a common name in continuous memory locations. Arrays can be one-dimensional, two-dimensional, or multi-dimensional depending on the number of subscripts used. A one-dimensional array uses a single subscript and stores elements in sequential memory locations. Arrays can be initialized at compile-time by specifying values between curly braces after declaration, or at run-time by using input functions like scanf to populate elements.

1. Presentedby:
Mk dheeran
Teach guru

2. Introduction to
Arrays

3. What is an array ?
✘ Array is a collection of similar data items are
stored under a common name.
✘ It is a continuous memory location.
✘ The lowest address corresponds to the first
element and largest address to the last element.
✘ Example:
a[3]={1,2,3}
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4. Classification of arrays:
 Depending upon the number of subscripts used,
arrays are classified into three types
1. One-dimensional array
2. Two- dimensional array
3. Multi – dimensional array
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5. One Dimensional Array:
Syntax:
data_typevariable_name[dimensional/size of an array];
Example:
a[5]={1,2,3,4,5}
5
Name a[0] a[1] a[2] a[3] a[4]
Value 1 2 3 4 5
Address 1000 1001 1002 1003 1004

6. Initialization:
An array can be initialized at
I. compile time
II. run time
✘ After declaration ,the array elements must be
initialized otherwise they hold garbage value.
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7. 1.Compile time initialization:
 Initialization at the time of the declaration is known as compile time
initialization.
Syntax:
data_typevariable_name[dimensional/size of an array]={value1, value2,…value n};
Example:
• int a[5]={1,2,3,4,5};
• int b[]={1,2,3,4,5};
• char name[]={‘A’,’B’,’C’};
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8. 2. Run time initialization:
 When the array have large number of elements then the
array elements can be initialize at run time.
Syntax:
scanf(“format specifier”, &variablename[size] );
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