Arrays in C

Types of Arrays:

(i)                       Single dimensional array

(ii)                   Multi dimensional array

Singledimentional Arrays:

#include<stdio.h>

#include<conio.h>

#define size 5

void main()

{

int array[size],i;

clrscr();

printf(“Enter 5 integers\n\n”);

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

{

printf(“Enter integer %d”,i+1);

scanf(“%d”,&array[i]);

}

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

{

printf(“\n Integer %d:%d\n”,i+1,array[i]);

}

getch();

}

Initializing Arrays:

#include<stdio.h>

#include<conio.h>

void main()

{

int i,a[4]={4,3,2,1};
clrscr();

for(i=0;i<4;i++)

printf(“a[%d]=%d\n”,i,a[i]);

getch();

}

Multidimensional array:

#include<stdio.h>

#include<conio.h>

void main()

{

int a[20][20], b[20][20], c[20][20],r,c,i,j;

clrscr();

printf(“Enter rows and columns value:”);

scanf(“%d%d”,&r,&c);

printf(“Enter 1^st matrix value:\n”);

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

{

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

{

scanf(“%d”,&a[i][j]);

}

}

printf(“Enter 2^nd matrix value:\n”);

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

{

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

{

scanf(“%d”,&b[i][j]);

}

}

printf(“Addition matrix:\n”);

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

{

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

{

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

printf(“%d\t”,c[i][j]);

}

}

printf(“\n”);

}

getch();

}

#include<stdio.h>

#include<conio.h>

#define MAX_ROWS 20

#define MAX_COLS 30

void main()

{

int a[MAX_ROWS][MAX_COLS], b[MAX_ROWS][MAX_COLS], c[MAX_ROWS][MAX_COLS];

int tot_row, tot_col, row, col;

clrscr();

printf(“How many rows?”);

scanf(“%d”,&tot_row);

printf(“How many columns?”);

scanf(“%d”,&tot_col);

printf(“Input for first table\n”);

for(row=0;row<tot_row;row++)

{

printf(“Enter the data row no. %d”,row+1);

for(col=0;col<tot_col;col++)

{

scanf(“%d”,&a[row][col]);

printf(“\t”);

}

}

printf(“Input for second table\n”);

for(row=0;row<tot_row;row++)

{

printf(“Enter the data row no. %d”,row+1);

for(col=0;col<tot_col;col++)

{

scanf(“%d”,&b[row][col]);

printf(“\t”);

}

}

for(row=0;row<tot_row;row++)

{

for(col=0;col<tot_col;col++)

{

c[row][col]=a[row][col]*b[row][col];

}

}

printf(“Sums of elements;\n”);

for(row=0;row<tot_row;row++)

{

for(col=0;col<tot_col;col++)

{

printf(“%d\t”,c[row][col]);

}

}

getch();

}

Initialization of character arrays:

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

char a[5]=”hari”;

int len;

clrscr();

printf(“Name = %s\n”,a);

len=strlen(a);

printf(“\n Length=%d”,len);

getch();

}

Two-dimensional character array:

#include<stdio.h>

#include<conio.h>

void main()

{

char month[ ][30] = {“January”, “February”, “March”, ”April”, “May”, “June”, “July”, “August”, “September”, “October”, “November”, “December”};

int mon_num;

clrscr();

printf(“Enter the month number:”);

scanf(“%d”,&mon_num);

if((mon_num>=0) && (mon_num<12))

{

printf(“\n Month corresponding to number %d is %s”,mon_num,month[mon_num-1]);

}

else

printf(“Invalid month”);

getch();

}

Null Terminated Strings:

Functions:

#include<string.h>

Strcpy(s2,s1);

Strcat(s1,s2);

Strcmp(s1,s2);

Strchr(s1,ch);

Strcmpi(s1,s2);

M=strlen(s1);

Strlwr(s1);

Strupr(s1);

Strrev(s1)

Strstr(s1,s2);

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

char name[30],str[30];

int len;

clrscr();

printf(“Enter your name:”);

gets(name);

strcpy(str,name);

printf(“The copied string is:%s”,str);

getch();

}

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

char name[30];

int len;

clrscr();

printf(“Enter your name:”);

gets(name);

len=strlen(name);

strrev(name);

printf(“The length of the string is:%d\n”,len);

printf(“The reversed string is:%s”,name);

getch();

}

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

char name[30];

clrscr();

printf(“Enter your name:”);

gets(name);

printf(“The uppercase string is\n”,strupr(name));

printf(“The lowercase string is\n”,strlwr(name));

getch();

}