diff --git a/To check prime or armstrong no. b/To check prime or armstrong no.
new file mode 100644
index 0000000..d61b123
--- /dev/null
+++ b/To check prime or armstrong no.	
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <math.h>
+int checkPrimeNumber(int n);
+int checkArmstrongNumber(int n);
+int main()
+{
+    int n, flag;
+    printf("Enter a positive integer: ");
+    scanf("%d", &n);
+    // Check prime number
+    flag = checkPrimeNumber(n);
+    if (flag == 1)
+        printf("%d is a prime number.\n", n);
+    else
+        printf("%d is not a prime number.\n", n);
+    // Check Armstrong number
+    flag = checkArmstrongNumber(n);
+    if (flag == 1)
+        printf("%d is an Armstrong number.", n);
+    else
+        printf("%d is not an Armstrong number.",n);
+    return 0;
+}
+int checkPrimeNumber(int n)
+{
+    int i, flag = 1;
+    for(i=2; i<=n/2; ++i)
+    {
+    // condition for non-prime number
+        if(n%i == 0)
+        {
+            flag = 0;
+            break;
+        }
+    }
+    return flag;
+}
+int checkArmstrongNumber(int number)
+{
+    int originalNumber, remainder, result = 0, n = 0, flag;
+    originalNumber = number;
+    while (originalNumber != 0)
+    {
+        originalNumber /= 10;
+        ++n;
+    }
+    originalNumber = number;
+    while (originalNumber != 0)
+    {
+        remainder = originalNumber%10;
+        result += pow(remainder, n);
+        originalNumber /= 10;
+    }
+    // condition for Armstrong number
+    if(result == number)
+        flag = 1;
+    else
+        flag = 0;
+    return flag;
+}
+Output