add 4th problem

pset3/4-count.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+int main(void) {
+  // Initialize counts
+  int count3 = 0, count5 = 0, count7 = 0;
+  int count = 0;
+
+  // Get input
+  int input;
+  scanf("%d", &input);
+
+  while (input != 0) {
+    // Add up counts
+    if ((input % 3 == 0) && (input % 5 != 0) && (input % 7 != 0)) {
+      count3++;
+    } else if ((input % 5 == 0) && (input % 7 != 0) && (input % 3 != 0)) {
+      count5++;
+    } else if ((input % 7 == 0) && (input % 5 != 0) && (input % 3 != 0)) {
+      count7++;
+    }
+
+    count++;
+
+    scanf("%d", &input);
+  }
+
+  // Print answers
+  printf("%.2f%%\n%.2f%%\n%.2f%%\n", 100 * count3 / (float)count,
+         100 * count5 / (float)count, 100 * count7 / (float)count);
+
+  return 0;
+}