diff --git a/armstrong.c b/armstrong.c
new file mode 100644
index 0000000..9227397
--- /dev/null
+++ b/armstrong.c
@@ -0,0 +1,26 @@
+#include<stdio.h>
+#include<math.h>
+void main(){
+    int i,a,b=0,c,d,e,sum=0;
+    printf("Enter a no.");
+    scanf("%d",&i);
+    a=i;e=i;
+    while(a){
+        a=a/10;
+        b++;
+    }
+    while(e){
+        c=e%10;
+        e=e/10;
+        d=pow(c,b);
+        sum=sum+d;
+    }
+
+
+    if(sum==i){
+        printf("No. is armstrong");}
+    else{
+        printf("No. is not armstong");
+    }
+    
+}
\ No newline at end of file
diff --git a/unionofarray.c b/unionofarray.c
new file mode 100644
index 0000000..4264deb
--- /dev/null
+++ b/unionofarray.c
@@ -0,0 +1,29 @@
+#include<stdio.h>
+void main(){
+    int a[50],b[50],c,d,i,j,f=0,g;
+    printf("Enter size of array 1:\n");
+    printf("Enter size of array 2:\n");
+    scanf("%d%d",&c,&d);
+    for(i=0;i<c;i++){
+        scanf("%d",&a[i]);
+    }
+    for(i=0;i<d;i++){
+        scanf("%d",&b[i]);
+    }
+    g=c-1;
+    for(i=0;i<d;i++){
+        for(j=0;j<c;j++){
+            if(a[j]==b[i])
+            f++;
+        }
+        if(f==0){
+            g++;
+            a[g]=b[i];
+        }
+        f=0;
+    }
+    for(i=0;i<=g;i++){
+        printf("%d",a[i]);
+    }
+
+}
\ No newline at end of file