Added program in c for printing unique elements in an array (#143)

* Added program in c for printing unique elements in an array

* Update unique-elements-in-an-array.c

* Update unique-elements-in-an-array.c

* Update unique-elements-in-an-array.c

* Update unique-elements-in-an-array.c

- Make array declaration dynamic
- Formatted the output
- Cleanup of extra spaces in the program

Co-authored-by: Arsenic <54987647+Arsenic-ATG@users.noreply.github.com>

arrays/README.md

@@ -7,6 +7,7 @@
 3. [Left Rotation of Array](c-or-cpp/left-rotation.cpp)
 4. [Shift Negatives in Array](c-or-cpp/shift-negatives.cpp)
 5. [Maximum Subarray Sum](c-or-cpp/max-subarray-sum.cpp)
+6. [Unique Elements in an Array](c-or-cpp/unique-elements-in-an-array.c)
 
 ### Python
 

arrays/c-or-cpp/unique-elements-in-an-array.c

@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(){
+    
+    int size;
+    /* take the size of the array from user as input */
+    printf("Enter size of the array: ");
+    scanf("%d", &size);
+    
+    /* dynamically create an array of the reqruired size */
+    int *a = (int*)malloc(sizeof(int)*size);
+    
+    if(size<0){
+        size = size*(-1);
+    }
+    
+    /* enter the elements to the array */
+    printf("Enter elements of the array: ");
+    for(int k=0; k<size; k++){
+        scanf("%d", &a[k]);
+    }
+    
+    int flag;    
+    printf("Unique elements of the array are : ");
+    for(int i=0; i<size; i++){
+        flag = 0;
+        
+        for(int j=0; j<=size; j++){
+
+            if(i != j && a[i] == a[j]){
+            
+                flag++;
+                  
+            }
+   
+        }
+        if(flag == 0){
+            printf("%d ", a[i]);
+        }
+    }
+}