Arrays IN C

ARRAYS IN C

Arrays

---------

It is a collection of variables of same datatypes

Syntax

---------

datatype variablename[size]

eg: int number[10];

      float amount[20];

index starts from 0 to n-1

Initialization of Arrays

------------------------------

int x[5]={10,20,30,40,50};

size=5.we can store 5 values in

x[0],x[1],x[2],x[3],x[4]

Array name is similar to the variable name(memory location) but the difference is array is a sequence of address

#include<stdio.h>

#include<conio.h>

void main()

{

int a[5];

clrscr();

printf("enter 5 nos");

scanf("%d %d%d%d%d",&a[0],&a[1],&a[2],&a[3],&a[4]);

printf("%d %d%d%d%d",a[0],a[1],a[2],a[3],a[4]);

getch();

}

#include<stdio.h>

#include<conio.h>

void main()

{

int a[5]={10,20,30,40,50};  //we can initialize less then what we have declared as size

clrscr();                    //eg: int a[5]={10,20,30} the other two values will be automatically assigned to zero

                                //int a[5]={10,20,30,40,50,60} is wrong.one value has been declared more

printf("%d %d%d%d%d",a[0],a[1],a[2],a[3],a[4]);

getch();

}

#include<stdio.h>

#include<conio.h>

void main()

{

int a[5];

clrscr();

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

{

printf("enter value of %d",i+1);

scanf("%d",&a[i];

}

for(i=4;i>=0;i--)

{

printf("%d",&a[i]);

}

getch();

}

Sum of n numbers

------------------------

#include<stdio.h>

#include<conio.h>

void main()

{

int x[20],s=0,n;

clrscr();

printf("enter no of numbers");

scanf("%d",&n);

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

{

printf("enter the value of %d",i+1);

scanf("%d",&a[i]);

}

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

{

s=s+x[i];

}

printf("the sum is %d",s);

getch();

}

Sorting the numbers

---------------------------

#include<stdio.h>

#include<conio.h>

void main()

{

int a[20],i,j,n;

clrscr();

printf("how many numbers");

scanf("%d",&n);

printf("enter the elemnts to be sorted");

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

{

scanf("%d",&a[i]);

}

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

{

for(j=i+1;j<n;j++)

{

if(a[i]>a[j])

{

y=a[i];

a[i]=a[j];

a[j]=y;

}

}

}

printf("The sorted Elements are \n")

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

printf(" \n%d",a[i]);

getch();

}

Array concatenation

----------------------------

#include<stdio.h>

#include<conio.h>

void main()

{

char na1[20],na2[20];

int l=0,l1=0;

clrscr();

printf("enter name1");

scanf("%s",na1);

printf("enter name2");

scanf("%s",na2);

while(na1[l]!='\0')

l++;

while(na2[l1]!='\0')

{

na1[l]=na2[l1];

l++;

l1++;

}

na1[l]='\0';

printf("the concatenated name is %s",na1);

getch();

}

Two dimensional arrays

--------------------------------

Table of values will have to be stored

Syntax:

----------

Returntype arrayname[row size][columnsize];

#include<stdio.h>

#include<conio.h>

void main()

{

int a[3][3],i,j;

clrscr();

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

{

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

{

printf("enter the (%d %d) value",i,j);

scanf("%d",a[i][j]);

}

}

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

{

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

{

printf("%d\ n",a[i][j]);

getch();

}

#include<stdio.h>

#include<conio.h>

void main()

{

int a[3][3],b[3][3],c[3][3],i,j;

clrscr();

printf("enter the array");

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

{

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

{

printf("enter the(%d%d) value",i,j);

scanf("%d",&a[i][j]);

}

}

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

{

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

{

printf("enter the(%d%d) value",i,j);

scanf("%d",&b[i][j]);

}

}

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

{

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

{

c[i][j]=a[i][j]+b[i][j];

}

}

printf("the resultant matrix is \n");

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

{

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

{

printf("%d\n",c[i][j]);

}

}

getch();

}

Matrix multiplication

--------------------------

#include<stdio.h>

#include<conio.h>

void main()

{

int a[4][4],b[4][4],c[4][4],i,j,m,n,p,q;

clrscr();

printf("enter the order of first matrix");

scanf("%d %d",&m,&n);

printf("enter the order of second matrix");

scanf("%d %d",&p,&q);

if(n!=p)

printf("multiplication is impossible");

else

{

printf("enter the first matrix %d elements",m*n);

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

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

scanf("%d",&a[[i][j]);

printf("enter the second matrix %d elements",p*q);

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

for(j=0;j<q;j++)

scanf("%d",&b[[i][j]);

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

{

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

Transpose of a matrix

-----------------------------

#include<stdio.h>

#include<conio.h>

Void main()

{

Int a[3][3],I,j;

Clrscr();

Printf(“enter matrix elements”);

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

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

scanf(“%d”,&a[i][j]);

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

{

printf(“\n”);

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

{

printf(“%d”,a[j][i]);

}

}

getch();

}