diff --git a/C/AmstrongNumber.c b/C/AmstrongNumber.c
new file mode 100644
index 0000000..12d5f69
--- /dev/null
+++ b/C/AmstrongNumber.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+int main() {
+    int num, originalNum, remainder, result = 0;
+    printf("Enter a three-digit integer: ");
+    scanf("%d", &num);
+    originalNum = num;
+
+    while (originalNum != 0) {
+       // remainder contains the last digit
+        remainder = originalNum % 10;
+        
+       result += remainder * remainder * remainder;
+        
+       // removing last digit from the orignal number
+       originalNum /= 10;
+    }
+
+    if (result == num)
+        printf("%d is an Armstrong number.", num);
+    else
+        printf("%d is not an Armstrong number.", num);
+
+    return 0;
+}
diff --git a/C/FibonacciSeriec.c b/C/FibonacciSeriec.c
new file mode 100644
index 0000000..2ed40ab
--- /dev/null
+++ b/C/FibonacciSeriec.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+int main() {
+    int t1 = 0, t2 = 1, nextTerm = 0, n;
+    printf("Enter a positive number: ");
+    scanf("%d", &n);
+
+    // displays the first two terms which is always 0 and 1
+    printf("Fibonacci Series: %d, %d, ", t1, t2);
+    nextTerm = t1 + t2;
+
+    while (nextTerm <= n) {
+        printf("%d, ", nextTerm);
+        t1 = t2;
+        t2 = nextTerm;
+        nextTerm = t1 + t2;
+    }
+
+    return 0;
+}