Unknown error
Aug 14, 2013 at 4:54pm UTC
I'm working on a program to simulate an elevator, and to stop my elevator from going upt to floors with no people, I have it check if all the other floors have a value of zero, and if they do, then that means to stay put. I just started to work on this when I got this error on line 132.
|132|error: lvalue required as left operand of assignment
Here is the code, if some one could help I would really appreciate it.
1 [code][code]#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int main()
{
srand(time(NULL));
//Random people on each floor
int people1 = rand()%3 + 1;
int people2 = rand()%3 + 1;
int people3 = rand()%3 + 1;
int people4 = rand()%3 + 1;
int people5 = rand()%3 + 1;
int currentPeople = 0;
//Sotores that button was pushed.
int pushed = 1;
//Up buttons outside the elevator
int Up1;
int Up2;
int Up3;
int Up4;
int Up5;
//Represnts all otheer floors emty
int empty = 0;
//Door Control
int Door;
int Open = 2;
//People in elevator?
int People;
int inElevator = 3;
//Keep track of current floor
int CurrentFloor;
//to end all loops
int x = 1;
//Simulate people calling elevator
//check floor 1
cout << "If floor one has someone on it, press one. If not, press 0." << endl;
cin >> Up1;
if (Up1 == pushed){
cout << "Floor one has been qued!" << endl;
}
//check floor 2.
cout << "If floor two has someone waiting, press one. If not, zero." << endl;
//did someone call on floor 2?
cin >> Up2;
// If so...
if (Up2 == pushed){
cout << "Floor two has been qued." << endl;
}
//check F3
cout << "If floor 3 has someone waiting press one. If not, press 0." << endl;
cin >> Up3;
if (Up3 == pushed){
cout << "Floor three has been qued" << endl;
}
//check F4
cout << "If someone is on Floor 4 press one. If not press 0" << endl;
cin >> Up4;
if (Up4 == pushed){
cout << "Floor 4 has been qued!" << endl;
}
//check F5
cout << "If someone is on Floor 5, press one. If not press 0." << endl;
cin >> Up5;
if (Up5 == pushed){
cout << "Floor 5 has been qued!" << endl;
}
//Pick Up System
if (Up1 == pushed){
cout << "Elevator has arrived on Floor One! Door opening!" << endl << endl;
Door = Open;
while (x < 250000000) {
x++;
}
x = 0;
cout << "Door has opened." << endl << endl;
CurrentFloor = 1;
cout << people1 << " people coming in." << endl << endl;
currentPeople = currentPeople + people1;
while (x < 250000000) {
x++;
}
x = 0;
cout << "There are now " << currentPeople << " on elevator" << endl << endl;
cout << "Door Closing!" << endl << endl;
Door = 1;
while (x < 250000000) {
x++;
}
}
x = 0;
if (Up2 + Up3 + Up4 + Up5 = empty){
cout << "Insert Logic here!" << endl;
}
//elevator rising
cout << "Elevator rising to next level." << endl << endl;
while (x < 350000000) {
x++;
}
x = 0;
if (Up2 == pushed){
cout << "Elevator has arrived on Floor Two! Door opening!" << endl << endl;
Door = Open;
while (x < 250000000) {
x++;
}
x = 0;
cout << "Door has opened." << endl << endl;
CurrentFloor = 2;
cout << people2 << " people coming in." << endl << endl;
currentPeople = currentPeople + people2;
while (x < 250000000) {
x++;
}
x = 0;
cout << "There are now " << currentPeople << " on elevator" << endl << endl;
cout << "Door Closing!" << endl << endl;
Door = 1;
while (x < 250000000) {
x++;
}
}
x = 0;
cout << "Elevator rising to next level." << endl << endl;
while (x < 350000000) {
x++;
}
x = 0;
if (Up3 == pushed){
cout << "Elevator has arrived on Floor Three! Door opening!" << endl << endl;
Door = Open;
while (x < 250000000) {
x++;
}
x = 0;
cout << "Door has opened." << endl << endl;
CurrentFloor = 3;
cout << people3 << " people coming in." << endl << endl;
currentPeople = currentPeople + people3;
while (x < 250000000) {
x++;
}
x = 0;
cout << "There are now " << currentPeople << " on elevator" << endl << endl;
cout << "Door Closing!" << endl << endl;
Door = 1;
while (x < 250000000) {
x++;
}
}
x = 0;
cout << "Elevator rising to next level." << endl << endl;
while (x < 350000000) {
x++;
}
x = 0;
if (Up4 == pushed){
cout << "Elevator has arrived on Floor Four! Door opening!" << endl << endl;
Door = Open;
while (x < 250000000) {
x++;
}
x = 0;
cout << "Door has opened." << endl << endl;
CurrentFloor = 4;
cout << people4 << " people coming in." << endl << endl;
currentPeople = currentPeople + people4;
while (x < 250000000) {
x++;
}
x = 0;
cout << "There are now " << currentPeople << " on elevator" << endl << endl;
cout << "Door Closing!" << endl << endl;
Door = 1;
while (x < 250000000) {
x++;
}
}
x = 0;
cout << "Elevator rising to next level." << endl << endl;
while (x < 350000000) {
x++;
}
x = 0;
if (Up5 == pushed){
cout << "Elevator has arrived on Floor Five! Door opening!" << endl << endl;
Door = Open;
while (x < 250000000) {
x++;
}
x = 0;
cout << "Door has opened." << endl << endl;
CurrentFloor = 5;
cout << people5 << " people coming in." << endl << endl;
currentPeople = currentPeople + people5;
while (x < 250000000) {
x++;
}
x = 0;
cout << "There are now " << currentPeople << " on elevator" << endl << endl;
cout << "Door Closing!" << endl << endl;
Door = 1;
while (x < 250000000) {
x++;
}
}
x = 0;
}
Aug 14, 2013 at 5:02pm UTC
The expression in the if statement== empty){
Aug 14, 2013 at 5:20pm UTC
I did mean the comparison. Thank you very much. I'm just thinking of the logic of my program and not taking a step back to look at the small details and errors. Thanks again for your help.
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