Array Operations

To increment the ith element the following statements can be used.

a[i]++;

a[i]+=1;

a[i]=a[i]+1;

To add value n to the ith element the following statements may be used.

a[i]+=n;

a[i]=a[i]+n;

To copy the contents of the ith element to kth element.

a[k]=a[i];

To copy content from an array to another.

int a[10],b[10];

for(i=0;i<10;i++)

b[i]=a[i];

Example Program 1:

C program to find sum of all elements in an array.

#include<stdio.h>
main()
{
int a[10],i,n,s=0;
printf("Enter the size of array: "); 
scanf("%d",&n);
printf("Enter n elements into array: ");
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
}
for(i=0;i<n;i++)
{
s=s+a[i];
}
printf("The sum of elements is %d",s); }

Output:

Example Program 2:

C program to replace even numbers in array by 0.

#include <stdio.h>
main()
{
int a[10],i,n;
printf("Enter the size of array: "); 
scanf("%d",&n);
printf("Enter n elements into array: "); 
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
}
for(i=0;i<n;i++)
{
if(a[i]%2==0)
a[i]=0;
}
printf("The array elements are: "); 
for(i=0;i<n;i++)
printf("%d\t",a[i]);
}

Output:

Example Program 3:

C program to print the array elements in reverse order.

#include<stdio.h>
main()
{
int a[10],i,n;
printf("enter the size of array\n"); 
scanf("%d",&n);
printf("enter n elements into array: "); 
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
}
printf("the elements in reverse order\t"); 
for(i=n-1;i>=0;i--)
{
printf("%d\t",a[i]);
}
}

Output:

Example Program 4:

C program to print the numbers greater than average.

#include<stdio.h>
main()
{
int a[10],n,i,s=0; 
float avg;
printf("enter the number of elements: "); 
scanf("%d",&n);
printf("enter the elements: "); 
for(i=0;i<n;i++)
{
scanf("%d",&a[i]); 
s=s+a[i];
}
avg=(float)s/n;
printf("The numbers greater than average:"); 
for(i=0;i<n;i++)
{
if(a[i]>avg)
{
printf("%d ",a[i]);
}
}
}

Output: