Lvalue required as left operand of assignment

Projects Interfacing w/ Software on the Computer
1

Hello everyone. I am working on a ssd1306 alien-blast style game and this is my code. I dont know why but everytime I try to check it, it says" lvalue required as left operand of assignment" Can somebody fix this please?

#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
 int a1h = 0;
   int a2h = 0;
   int a3h = 0;
#define SCREEN_HEIGHT 64
#define SCREEN_WIDTH 128
#define OLED_RESET     -1 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
float x = 9.13392857143;
#define imageWidth 15
#define imageHeight 16
int userx = 55;
int usery= 40;
int deathraytimer = 0;
int deathray = 0;
int deathrayx = userx;
const unsigned char bitmap2 [] PROGMEM=
{
0x8F, 0x73, 0xFD, 0xC1, 0xBF, 0x01, 0xFD, 0xF3, 0xFD, 0x01,
0xBF, 0xC1, 0xFD, 0x73, 0x8F, 0xFF, 0xFF, 0xFC, 0xF8, 0xF3,
0xE6, 0x80, 0x07, 0x80, 0xE6, 0xF3, 0xF8, 0xFC, 0xFF, 0xFF
};

const unsigned char bitmap [] PROGMEM=
{
0xFF, 0x7F, 0xBF, 0x5F, 0x5F, 0x6F, 0x27, 0xC1, 0x27, 0x6F,
0x5F, 0x5F, 0xBF, 0x7F, 0xFF, 0xFF, 0xFC, 0x03, 0xB7, 0xD6,
0xE1, 0x87, 0x6B, 0x87, 0xE1, 0xD6, 0xB7, 0x03, 0xFC, 0xFF
};
int a3x = random(0,113);
   int a1x = random(0,113);
   int a2x = random(0,113);
void setup() {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();


}

void loop() {
  display.clearDisplay();
  userx = analogRead(A6) / x;
  if(a3h=1){
  int a3x = random(0,113);
  }
  if(a1h=1){
   int a1x = random(0,113);
  }
  if(a2h=1){
   int a2x = random(0,113);
  }
   a1h = 0;
   a2h = 0;
   a3h = 0;
if(digitalRead(3)= HIGH, deathraytimer = 0){
  deathrayx = userx;
  deathraytimer = 100; 
  deathray = 1;
}
if(deathray = 1){
  display.drawLine(deathrayx +7,45,deathrayx +7, 0, WHITE );
  if(deathraytimer > 0){
    deathraytimer = deathraytimer - 1;
if (deathrayx + 7 = a1x){
  a1h = 1;
}
if (deathrayx + 7 = a2x){
  a2h = 1;
}
if (deathrayx + 7 = a3x){
  a3h = 1;
}
  }
  else(){
    deathray = 0;
  }
}
display.drawBitmap(userx, usery, bitmap, 15, 16);
display.drawBitmap(a1x, 0, bitmap2, 15, 16);
display.drawBitmap(a2x, 0, bitmap2, 15, 16);
display.drawBitmap(a3x, 0, bitmap2, 15, 16);
display.display();
delay(20);
}
2

First of all, post your code correctly, using the tags you should click on the toolbar under < code > .

All "ifs" are written wrong
all have 1 sign =
If equality comparison must have 2 signs ==.

Ex:
wrong if (deathrayx + 7 = a1x) {
right if (deathrayx + 7 == a1x) {

and
what is this ???

if (digitalRead(3) = HIGH, deathraytimer = 0) {

may be
if (digitalRead(3) == HIGH && deathraytimer == 0) { ?

and
wrong else() {
right else {

and.... so....

3

This will help you very much: You should start Arduino programming with the IDE >> EXAMPLES >> BUILT-IN >> sketches to help you understand how the code works before blasting aliens. You will have more fun writing code yourself than expecting others to fix broken internet finds for you.

4

Please edit your post, select all code and click the <CODE/> button; next save your post. This will apply code tags which makes your code easier to read, easier to copy and the forum software will handle it correctly.

5

Thanks for your answer, I am new at coding at I knew I had mistakes.

6

Done.

1 Like
7

I didnt know about that, thanks for your help.

8

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