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Ich bekomme immer einen Segmentierungsfehler, wenn ich versuche, der aktuellen Hex-Zahl eine Hex-Zahl hinzuzufügen. Hier ist die Linie, wo ich meine Segmentation fault immer (glaube ich):Segmentierungsfehler C++ Hexadezimalrechner
newHex->insertTail(sum);
Hier ist das ganze Programm:
#include <iostream>
#include <vector>
#include <stdlib.h>
#include <string>
using namespace std;
#undef NULL
const int NULL = 0;
const char SENTINEL = '#';
typedef int element;
class listnode {
public:
element data;
listnode * next;
};
class LList {
private:
listnode * head;
listnode * tail;
listnode * view;
public:
LList();
~LList();
void read();
listnode* next();
void print();
void insertTail(element val);
void clean();
//void add(LList operand);
//void multiply(LList operand);
element deleteHead();
};
class Calculator {
public:
Calculator();
LList* add(LList& left, LList& right);
//LList* multiply(LList& left, LList& right);
};
Calculator::Calculator() {
};
LList* Calculator::add(LList& left, LList& right) {
int sum, carry = 0, lval = 0, rval = 0;
bool calculating = true;
listnode *leftNode;
listnode *rightNode;
LList* newHex;
while(calculating) {
leftNode = left.next();
rightNode = right.next();
if(leftNode == NULL) {
lval = 0;
}
else
lval = leftNode->data;
if(rightNode == NULL) {
rval = 0;
}
else
rval = rightNode->data;
if(leftNode == NULL && rightNode == NULL) {
calculating = false;
if(carry != 0) {
newHex->insertTail(carry);
}
break;
}
sum = lval + rval + carry;
carry = 0;
if(sum >= 16) {
carry = 1;
sum -= 16;
}
cout << "Segmentation Fault Below :)" << endl;
newHex->insertTail(sum);
}
return newHex;
};
listnode* LList::next() {
listnode* temp = view;
if(temp != NULL)
view = view->next;
if(view == NULL) {
}
return temp;
};
LList::LList(){
head = NULL;
view = NULL;
};
void LList::print() {
listnode * temp;
int i = 0;
string printValues;
temp = head;
while(temp != NULL) {
int var = temp -> data;
char character = ' ';
if(i % 3 == 0 && i != 0)
printValues += ',';
i++;
if(var > 9 && var < 16)
{
character = static_cast <char>(var + 65 - 10);
}else if (var <= 9 && var >= 0)
character = static_cast <char>(var + 48);
printValues += character;
temp = temp -> next;
}
string tempValues;
for(int i = printValues.length() - 1; i >= 0; i--)
tempValues += printValues[i];
cout << tempValues;
cout << endl;
};
void LList::read() {
string userval;
int i;
bool parsing = true;
char curval;
vector <int> values;
clean();
while(parsing) {
cin >> userval;
for(unsigned int i = 0; i < userval.length(); i++) {
curval = userval[i]; //this is your character
if(curval >= 48 && curval <= 57)
values.push_back(static_cast <int>(curval -
48));
if(curval >= 65 && curval <= 70)
values.push_back(static_cast <int>(curval -
65 + 10));
if(curval == ' ')
break;
if(curval == SENTINEL) {
parsing = false;
break;
}
}
}
for(int i = values.size() -1; i >= 0; i--) {
insertTail(values[i]);
}
};
void LList::insertTail(element val) {
listnode * temp;
temp = new listnode;
temp -> data = val;
temp -> next = NULL;
if(head == NULL) {
head = temp;
view = head;
}
else
tail -> next = temp;
tail = temp;
};
void LList::clean() {
while(head != NULL)
deleteHead();
};
void validCommands() {
cout << "Valid commands are:" << endl;
cout << " e enter enter the current ";
cout << "hexadecimal ";
cout << "number from the keyboard" << endl;
cout << " a add add a new hexadecimal ";
cout << "number to the current hex. number" << endl;
cout << " m multiply ";
cout << "multiply a new hexadecimal number ";
cout << "by the current hex. number" << endl;
cout << " h help show this help menu" << endl;
cout << " q quit quit the program" << endl << endl;
};
/*
void LList::multiply(LList operand) {
int left, right, product, carry;
listnode* operandNext = operand.next();
listnode* currentNode = this->head;
while(operandNext != NULL) {
left = operandNext->data;
right = currentNode->data;
product = left * right;
carry = 0;
if(product >= 16) {
product -= 16;
carry = 1;
}
if(currentNode == NULL) {
this->insertTail(left);
}
currentNode->data = product;
currentNode = currentNode->next;
operandNext = operandNext->next;
}
};
*/
element LList::deleteHead() {
listnode * temp;
temp = head;
head = head -> next;
delete temp;
return temp -> data;
};
LList::~LList(){
delete head;
};
int main() {
LList L, add,multiply;
Calculator calc;
L.insertTail(0);
char option;
bool run;
cout << "Hexadecimal Calculator, Ver 1.0.0 \n";
cout << endl;
do {
cout << "Current Hexadecimal number is: ";
L.print();
cout << endl;
cout << "Command (h for help): ";
cin >> option;
cout << endl << endl;
switch(option) {
case 'e' :
cout << "Enter a hexadecimal number ";
cout << "followed by #: ";
L.read();
cout << endl << "Entering completed.";
cout << endl << endl;
break;
case 'a' :
cout << "Adding a new hexadecimal number ";
cout << "to the current hex. number" << endl;
cout << endl;
cout << "Enter a hexadecimal ";
cout << "number, follow by #: ";
add.read();
cout << endl << "Addition completed.";
cout << endl;
L = *calc.add(L, add);
cout << endl;
break;
case 'm' :
cout << "Multiplying a new hexadecimal ";
cout << "number ";
cout << "to the current hex. number" << endl;
cout << endl;
cout << "Enter a hexadecimal ";
cout << "number, follow by #: ";
//multiply.read();
cout << endl << "Multiplication completed.";
cout << endl;
//L.multiply(multiply);
cout << endl;
break;
case 'h' : validCommands();
break;
case 'q' : run = false;
break;
};
} while (run);
exit(0);
}
Was haben Sie beim Durchlaufen Ihres Codes mit dem Debugger beobachtet? –
'Hier ist die Zeile, in der ich meine Segmentierungsfehler erhalte (denke ich)' Wirst du ein Programmierer oder Wahrsager sein? Du musst die Linie nicht wirklich erraten. Es gibt Werkzeuge, die die genaue Linie, Werte aller Variablen, Stack-Trace usw. angeben. Verwenden Sie einen Debugger! – Drop
'const int NULL = 0;' - Das ist keine gute Idee - macht Dinge verwirrend –