number of 0s before 1 (count_if)

main.cpp

@@ -22,10 +22,10 @@ void printlm(T m){
 int prompti(string,bool*);
 int prompti(string,bool*);
 string prompts(string,bool*);
-bool isneg(int);
+bool num0b1(int);
 
 int main() {
-  printlm("Get the number of negatives from::");
+  printlm("Get the number of 0s before 1 from:");
   bool s {};
   ilist lst {};
   do {
@@ -34,10 +34,8 @@ int main() {
       lst.push_back(v);
     }
   } while (s);
-  printm("Number of negatives (Defined): ");
-  printlm(count_if(lst.cbegin(), lst.cend(), isneg));
-  printm("Number of negatives (Lambda): ");
-  printlm(count_if(lst.cbegin(), lst.cend(), [] (int x) { return x < 0;}));
+  printm("Number of 0s before 1: ");
+  printlm(count_if(lst.cbegin(),lst.cend(), num0b1));
   return 0;
 }
 
@@ -80,6 +78,12 @@ string prompts(string message, bool *status) {
   return tr;
 }
 
-bool isneg(int x) {
-  return x < 0;
+bool num0b1(int x) {
+  static bool has1 {};
+  if (x == 1) has1 = true;
+  if (has1 || x != 0) {
+    return false;
+  } else {
+    return true;
+  }
 }