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Keypoints:-

C MAIN FORMAT

ONE D ARRAY

TWO D ARRAY

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Quick information on format:-

main(){

…………………………………………………………………………………..

}

Function name

Start of program

Program statements

End of program

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Finally Array

Fixed size sequence collection of elements of same data type.

Simply a grouping of data types.

Used to list of names or numbers.

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Theory related :-

Declaring individual variables?....such as number 0, number 1, and number 99.But in Array

Number[1]

Number[2]

Number[99]

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All array consists of continuous memory locations.

Numbers[0] Number[1] Number[2] Number[3] ………………

First element Last element

Lowest address corresponds Highest address corresponds

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Three types of Array:-

One dimensional Array

Two dimensional Array

Multi dimensional Array

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One dimensional Array:-

The values to the array elements can be assigned as follows

number[0]

number[1]number[2]number[3]

number[4]

35

40

205719

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One dimensional Array(includes):-

Declaration of one dimensional Array Initialization of one dimensional Array

Specifies properties of an identifier

It declares what a word (identifier) means.

Commonly used for functions ,variables , constants ….sometimes type definitions also

Assignment of an initial value for data object or variable.

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Declaration of one dimensional Array:-

data_type array_name[array_size];

float marks[5]Here, we declared an array , mark, of floating-point type and size 5. meaning , it can hold 5 floating points values.

Int group[10]

It declares the group as an array contain 10 integer constants.

char name [10];

It declares the name as a character array that hold maximum of 10 character.

For example

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How to initializ

e?

Type array-name[size]={list of value};

For example Int mark[5]={19,10,8,17,9};

Mark[4]

Mark[3]

Mark[2]

Mark[1]

Mark[0]

19 10

8 17 9

Float total[5]={0.0,15.75,-10};

Another method to initialization an array

Char name[]={ ‘N’, ’I’, ’S’, ’S’, ’O’ ,’N’};

Int mark[]={19,10,8,17,9}

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Example of one dimensional array with the help of program:-

Write a program to print the sum of 10 numbers using one D Array

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One D array

#include<stdio.h>#include<conio.h>Void main(){ int a[10], I, sum=0; clrscr();

printf(” enter 10 array elements”); for(i=0; i<10; i++;){ scanf(“%d”, &a[i]); sum= sum+a[i];} printf(“ summation of array elements is %d”, sum); getch();}

Header file

Pre defined function

Data types

Pre defined function for printing output

loop

statements

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Output int a[10], I, sum=0; clrscr(); printf(” enter 10 array elements”); for(i=0; i<10; i++;){ scanf(“%d”, &a[i]); sum= sum+a[i];} printf(“ summation of array elements is

%d”,sum);

20

1

30 40 50 60 70 80 90 100

0

10

2 3 4 5 6 7 8 9

a[0] a[1] a[8]a[4] a[7]a[6]a[3]a[2] a[5] a[9]

Output=550

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2. Write a program of odd & even elements from 1D Array.

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#include<stdio.h>#include<conio.h>Void main(){ int a[10], n, esum=0, Osum=0, j; clrscr(); printf(“how many elements?”); scanf(“%d”, &n); printf(“enter array elements”); for(i=0; i<n; i++);{ scanf(“%d”, &a[i]); if(a[i]%2==0){ esum++;} else{ osum++;} printf(“even elements %d \n odd elements %d”, esum,osum); getch();}

For even

For odd

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printf(“enter array elements”);

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

{

scanf(“%d”, &a[i]);

if(a[i]%2==0)

{

esum++;

}

else

{

osum++;

}

printf(“even elements %d \n odd elements %d”, esum , osum);

Output 20 35 4010 45 60 70 900 31 2 654 7

Even elements=6

Odd elements=2

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17Two dimensional array:-

Type array_name [row size] [coloumn_size];

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How to initialize two dimensional array?

Int table [2] [3]={0,0,0,1,1,1};

Int table [2] [3]={ {0,0,0},{1,1,1}};

Int table [2] [3]={ {0,0,0}, {1,1,1} };

Also initialize in the form of a matrix.

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Example of two dimensional array:-

Program to read and display a simple 3*3 matrix

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#include<stdio.h>#include<conio.h>Void main(){Int I,j,a[3] [3];Clrscr();Printf(“enter the element of 3*3 matrix:”);For(i=0;i<3;i++)For(j=0;j<3;j++){ printf(“a[%d] [%d]=“,I,j); scanf(“%d”,&a[i] [j]); printf(“the various elements contained in the 3*3 matrix are:\n”); for(i=0;i<3;i++){ for(j=0;j<3;j++) printf(“%d\t”,a[i] [j]);}Getch();}

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Enter the elements of the 3*3 matrix:A[0] [0]=1A[0] [1]=2A[0] [2]=3A[1] [0]=4A[1] [1]=5A[1] [2]=6A[2] [0]=7A[2] [1]=8A[2] [2]=9the various elements contained in 3*3 matrix are:1 2 34 5 67 8 9

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That’s it…..

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