add first 2 problems

pset3/1-rhombus.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+int main(void) {
+  // Initialize variables
+  int level;
+  scanf("%d", &level);
+
+  // Iterate over lines and print rhombus
+	// Upper half
+  for (int i = 1; i <= level; i++) {
+    for (int k = 0; k < level - i; k++) {
+      printf(" ");
+    }
+    for (int j = 0; j < i * 2 - 1; j++) {
+      printf("*");
+    }
+    printf("\n");
+  }
+	// Lower half
+  for (int i = level - 1; i > 0; i--) {
+    for (int k = 0; k < level - i; k++) {
+      printf(" ");
+    }
+    for (int j = 0; j < i * 2 - 1; j++) {
+      printf("*");
+    }
+    printf("\n");
+  }
+
+  return 0;
+}

pset3/2-power.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main(void) {
+  // Initialize values and get input
+  int a, b, c = 1;
+  scanf("%d%d", &a, &b);
+
+  // Iterate and calculate result
+  for (int i = 0; i < b; i++) {
+    c *= a;
+  }
+
+	// Print answer
+	printf("%d\n", c);
+
+  return 0;
+}