Arrays in C

   /* arrays in c */

Before going to discuss about arrays lets go through some sample program

main()
{
  int a,b;
  printf("\n enter any two values");
  scanf("%d%d",&a,&b);
  printf("the given two values are a=%d\tb=%d",a,b);
}

output:
    enter any two values
     10 20
   the given two values are a=10   b=20

well this program good for reading two values
so what if we want to read 50 variables from keyboard ?
one solution is intialising 50 variables like a,b,c,d,,,,,,,, and reading varibales of
keyoard from scanf function.
But declaring 50 variables is looking complex

Arrays:
     main()
     {
        int a[10];
         a[0]=101;
         a[1]=102;
         a[2]=103;
         a[3]=104;
         a[4]=105;
         a[5]=106;
         a[6]=107;
         a[7]=108;
         a[8]=109;
         a[9]=110;
       printf("\n%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d",a[0],a[1],a[2],a[3],a[4],a[5],a[6],a[7],a[8],a[9]);
     }
 
     output:101   102 103 104 105 106 107 108 109


main()
{
   int a[10];/* a is an array which occupies (10*2)bytes of memory */
   int i,n;
   printf("enter your range");
   scanf("%d",&n);/* no of elements */
   printf("enter %d elements",n);
   for(i=0;i<10;i++)
   {
      scanf("%d",&a[i]);
    }
   printf("\n\nentered elements are");
   for(i=0;i<10;i++)
   {
      printf("\t%d",a[i]);
   }
}

output:
    enter your range
    10
    enter 10 elements
    1 2 3 4 5 6 7 8 9 10


    entered elements are 1 2 3 4 5 6 7 8 9 10
 
/* program to calculate the total marks and average marks for give six subjects*/

  main()
  {
    int a[6],i,total=0;
     float avg;
     printf("\n enter your six subject marks");
     for(i=0;i<6;i++)
      {
        scanf("%d",&a[i]);
      }
     for(i=0;i<6;i++)
     {
      total=total+a[i];
     }
     avg=total/6.0;
    printf("\n total marks is %d",total);
    printf("\average marks is %f",avg);
  }
 
output:
    enter your six subject marks
        90 90 90 80 100 90
       total marks is 540
       average marks is 90




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