Example-
Array is {3,2,5,6,0,1}
After swap {2,3,6,5,1,0}
program-
#include< stdio.h>
#include< math.h>
int main()
{
int a[100],n,i,t;
printf("Enter number of elements\n");
scanf("%d",&n);
printf("Enter %d number in array\n",n);
//input in array
for(i=0;i< n;i++)
{
scanf("%d",&a[i]);
}
//Swap the Adjacent numbers
for(i=0;i< n;i=i+2)
{
t=a[i];
a[i]=a[i+1];
a[i+1]=t;
}
//Now traverse
printf("Now Array is\n");
for(i=0;i< n;i++)
{
printf("%d,",a[i]);
}
}
Enter number of elements
6
Enter 6 number in array
1 2 3 4 5 6
Now Array is
2,1,4,3,6,5,