----------------------------
int[] grades = getGradeList()
boolean found = false
int seeking = prompt("What value to find?")0
for (int i = 0; i < grades.size; i=i+1){
   if (grades[i] == seeking) {
		found = true
	  }
}
if (found) {
	print("found a " + seeking)
}


----------------------------
// WRONG:
int[] grades = getGradeList()
boolean found = false
int seeking = prompt("What value to find?")
for (int i = 0; i < grades.size; i=i+1){
   if (grades[i] == seeking) {
		   found = true
	  } else {			  // NO
		   found = false // NO
	  }
}
if (found) {
	print("found a " + seeking)
}

----------------------------
int[] grades = getGradeList()
int seeking = prompt("What value to find?")
for (int i = 0; i < grades.size; i=i+1) {
   if (grades[i] == seeking) {
		  print("found a " + seeking + " at " + i)
	 }
}

----------------------------
int[] grades = getGradeList()
int seeking = prompt("What value to find?")
int foundAt
boolean found = false
for (int i = 0; i < grades.size; i=i+1){
   if (grades[i] == seeking) {
		  foundAt = i
		  found = true
	 }
}
if (found) {
	print("found " + grades[foundAt] +" at "+ foundAt)
}

----------------------------
int[] grades = getGradeList()
int seeking = prompt("What value to find?")
int foundAt = -1 // negative means not found
for (int i = 0; i < grades.size; i=i+1){
   if (grades[i] == seeking) {
		  foundAt = i
	 }
}
if (foundAt != -1) {
	print("found " + grades[foundAt] +" at "+ foundAt)
}

----------------------------
int[] grades = getGradeList()
int seeking = prompt("What value to find?")
int foundAt = -1
// end loop early if we found it
for (int i = 0; i < grades.size && foundAt == -1; i=i+1) {
   if (grades[i] == seeking) {
		  foundAt = i
	 }
}
if (foundAt != -1) {
	print("found " + grades[foundAt] +" at "+ foundAt)
}

----------------------------

int[] userIDs = getUserIDList
boolean valid = false
do {
	int user = prompt("What is your ID?")
	for (int i = 0; i < userIDs.size; i = i + 1) {
	 	if (user == userIDs[i]) {
	 		 valid = true
	 	}
	}
} while (!valid)
print("Welcome to the system, user #" + user)

// often we will want the location afterward,
// so could use index instead
int[] userIDs = getUserIDList
int foundAt = -1
do {
	int user = prompt("What is your ID?")
	for (int i = 0; i < userIDs.size; i = i + 1) {
		if (user == userIDs[i]) {
			foundAt = i
		}
	}
} while (foundAt == -1)
print("Welcome to the system, user #" + user)