Changed problem structure

msh.c

@@ -13,10 +13,12 @@
 #include "msh.h"
 
 #define clear() printf("\033[H\033[J")
-#define MATHLEN 100000
 
 static char *prompt = NULL;
 static bool skipMath = false;
+static size_t mathLen = 100;
+static size_t commandRun = 0;
+static char *mathOperation = "+-";
 
 union pipe {
 	int fileDesc[2];
@@ -271,7 +273,7 @@ char *getPrompt() {
 int randomNum(int limit) {
 	int num = 0;
 	if (limit != 0) {
-		num = rand()%limit +1;
+		num = rand()%limit + 1;
 	} else {
 		num = rand();
 	}
@@ -281,14 +283,12 @@ int randomNum(int limit) {
 int mathTest() {
 	int status = 0;
 	long numAnswer = 0;
-	int num1 = randomNum(MATHLEN);
-	int num2 = randomNum(MATHLEN);
+	int num1 = randomNum(mathLen);
+	int num2 = randomNum(mathLen);
 	long numSolution = 0;
 	char *numLine = NULL;
 
-	const char mathOperation[] = {'+', '-', '*', '/'};
-
-	int randProblem = randomNum(3);
+	int randProblem = randomNum(strlen(mathOperation)) - 1;
 
 	if (skipMath) {
 		return 0;
@@ -308,6 +308,9 @@ int mathTest() {
 			case '/':
 				numSolution = num1 / num2;
 				break;
+			default:
+				numSolution = 0;
+				break;
 
 		}
 		#ifndef RELEASEBUILD
@@ -336,6 +339,17 @@ int mathTest() {
 	return status;
 }
 
+void postCommand() {
+	commandRun++;
+	if ((commandRun % 3) == 0) {
+		mathLen *= 10;
+	}
+
+	if (commandRun == 3) {
+		mathOperation = "+-*/";
+	}
+	return;
+}
 
 void startShell() {
 	char *line = NULL;
@@ -347,6 +361,7 @@ void startShell() {
 			if (status == 0) { // Passed math test
 				add_history(line);
 				execCommand(line);
+				postCommand();
 			} else { // Failed math test
 				failedTest();
 			}