Added basic DMA

DMA.c

@@ -0,0 +1,32 @@
+/*This program shows the use of
+ *very basic functions of Dynamic memory
+ *allocation in C.
+ */
+#include<stdio.h>
+#include<stdlib.h>
+int linearsearch(int *a,int n,int key)
+{
+    int i=0;
+    for(int i=0;i<n;i++)
+    {
+        if(a[i]==key)
+            return i;
+    }
+    return -1;
+}
+int main()
+{
+    int i,*a,n,key;
+    printf("Enter the size of array\t");
+    scanf("%d",&n);
+    a=(int*)malloc(n*sizeof(int));
+    //Similar function calloc can also be used
+    for(i=0;i<n;i++)
+        scanf("%d",a+i);
+    printf("Enter the number to be searched\t");
+    scanf("%d",&key);
+    if(linearsearch(a,n,key)==-1)
+        printf("Number is not present in the array\n");
+    else printf("Element found at index %d\n",linearsearch(a,n,key));
+}
+