Array

Array is the set of variable of same data type.Suppose you need 3 int type variable in a program. You may declare 3 variable as follows:

int a,b,c;

memory space under a,b,c will be created which can be imagined as follows:

Now imagine you need 100 int type variable. Will you type int a1,a2,a3,a4,…………………, a100; ? It is so much cumbersome and time consuming. Array is a nice way to do this. You can declare 100 int type data by this keyword as follows:

int mark[100];

Here mark is the array name. 100 is the size of array. 100 variable name will be mark[0], mark[1], mark[2],mark[3],…. mark[99]. So memory spaces for

int mark[100];

can be imagined as follows:

Here 0,1,2,3,……..99 are called index number. Index number starts from 0.

General syntax of declaring array: 
data-type  array-name[size];

Example: 
If data type is float and size is 40 and name is score, then array declaration will be as follows:

float score[40]; 

Problem:
Input 10 integer numbers from keyboard and show the entered numbers.

Solution:

#include<stdio.h>
int main()
{
     int n[10],i;
     printf("Enter 10 integer numbers : ");
     for(i=0;i<10;i++)
     {
          scanf("%d",&n[i]);
     }
      printf("Your entered 10 integer numbers are :\n");
     for(i=0;i<10;i++)
     {
          printf("%d\n",n[i]);
     }
      return 0;
}

Problem:
Write a program to input 10 integer numbers from keyboard and store the numbers in an array. Finally show the highest number.
Solution:

#include<stdio.h>
int main()
{
      int n[10],i,max;
      printf("Enter 10 integer numbers : ");
      for(i=0;i<10;i++)
      {
           scanf("%d",&n[i]);
      }
      max=n[0];
      for(i=1;i<10;i++)
      {
          if(max>n[i])
           max=n[i];
      }
      printf("The highest number is : %d",max);
      return 0;
}

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