Finished first group of assignments

programs/rev3dig/main.c

@@ -0,0 +1,26 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Integer n: ");
+    scanf("%d", &n);
+
+    // Throw error when n is not in range of 100 <= n <= 999
+    if (n < 100 || n > 999) {
+        printf("Integer n must be 3 digit number");
+        return 1;
+    }
+
+    int a, b, c, m; // a * 10^2 + b * 10^1 + c * 10^0 = n
+
+    a = n / 100;
+    b = n / 10 % 10;
+    c = n % 10;
+
+    m = c * 100 + b * 10 + a; // m is reversed n
+
+    printf("Reversed integer is %d.", m);
+
+    return 0;
+}