d

armstrong

@@ -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;
+}

stringreverse

@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <string.h>
+int main()
+{
+   char s[100];
+
+   printf("Enter a string to reverse\n");
+   gets(s);
+
+   strrev(s);
+
+   printf("Reverse of the string: %s\n", s);
+
+   return 0;
+}