reprompt math question on C^d

msh.c

@@ -316,10 +316,15 @@ int mathTest() {
 		#ifndef RELEASEBUILD
 		printf("Answer: %ld\n", numSolution);
 		#endif
-		printf("%d %c %d = ", num1, mathOperation[randProblem], num2);
-		numLine = readline("");
-		if (numLine != NULL && strlen(numLine) > 0) {
-		  sscanf(numLine, "%ld", &numAnswer);
+		while(numLine == NULL) {
+			printf("%d %c %d = ", num1, mathOperation[randProblem], num2);
+			numLine = readline("");
+
+			if (numLine != NULL && strlen(numLine) > 0) {
+				sscanf(numLine, "%ld", &numAnswer);
+			}
+
+			free(numLine);
 		}
 
 		if (numSolution != numAnswer) { // If wrong answer
@@ -337,7 +342,6 @@ int mathTest() {
 	printf("\n");
 	#endif
 
-	free(numLine);
 	return status;
 }
 
@@ -370,6 +374,8 @@ void startShell() {
 		}
 		free(line);
 	}
+	printf("Exiting Shell\n");
+	sleep(2);
 	free(prompt);
 	prompt = NULL;
 }