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Calculator.ino
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#include <Keypad.h>
#include <Wire.h>
#include <math.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define max_size 15
#define ROWS 6
#define COLS 4
char keys[ROWS][COLS] = {
{'P','E','C','B'},
{'%','I','^','/'},
{'7','8','9','-'},
{'4','5','6','*'},
{'1','2','3','+'},
{'0','.','A','='}
};
byte rowPins[ROWS] = {0,7,8,6,4,1}, colPins[COLS] = {2,3,5,9};
double num[max_size]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
int op[max_size] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, state[max_size] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
double ans=0;
int n=0,o=0,i=0,d=0;
String numa="";
bool fla=1,ans1=0,flad=0,flai=0;
char key;
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
Keypad customKeypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS);
void clearall();
void setup()
{
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3D)) {
for(;;);
}
pinMode(10,OUTPUT);
digitalWrite(10,HIGH);
display.setTextSize(2);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.clearDisplay();
display.write("Calculator");
display.display();
display.clearDisplay();
display.setTextSize(2);
display.setCursor(0, 0);
}
void loop()
{
key = customKeypad.getKey();
switch(key)
{
case '0' ... '9':
display.write(key);
display.display();
if(fla) n++,fla=0;
if(flad) d++;
num[n-1] = num[n-1]*10 + (key - '0');
ans1=0;
break;
case '+':
if(ans1){
display.write("Ans");
display.display();
num[n]=ans;
n++;
ans1=0;
}
if(flad){
state[n-1]=d;
num[n-1]=num[n-1]/pow(10,d);
d=0;
flad=0;
}
display.write(key);
display.display();
op[o] = 1;
o++;
fla=1;
break;
case '-':
if(ans1){
display.write("Ans");
display.display();
num[n]=ans;
n++;
ans1=0;
}
if(flad){
state[n-1]=d;
num[n-1]=num[n-1]/pow(10,d);
d=0;
flad=0;
}
display.write(key);
display.display();
op[o] = 2;
o++;
fla=1;
break;
case '*':
if(ans1){
state[n-1]=d;
d=0;
display.write("Ans");
display.display();
num[n]=ans;
n++;
ans1=0;
}
if(flad){
state[n-1]=d;
num[n-1]=num[n-1]/pow(10,d);
d=0;
flad=0;
}
display.print("X");
display.display();
op[o] = 3;
o++;
fla=1;
break;
case '^' :
if(ans1){
display.write("Ans");
display.display();
num[n]=ans;
n++;
ans1=0;
}
if(flad){
state[n-1]=d;
num[n-1]=num[n-1]/pow(10,d);
d=0;
flad=0;
}
display.write(key);
display.display();
op[o] = 4;
o++;
fla=1;
break;
case '/' :
if(ans1){
display.write("Ans");
display.display();
num[n]=ans;
n++;
ans1=0;
}
if(flad){
state[n-1]=d;
num[n-1]=num[n-1]/pow(10,d);
d=0;
flad=0;
}
display.write(key);
display.display();
op[o] = 5;
o++;
fla=1;
break;
case '%' :
if(ans1){
state[n-1]=d;
d=0;
display.write("Ans");
display.display();
num[n]=ans;
n++;
ans1=0;
}
if(flad){
state[n-1]=d;
num[n-1]=num[n-1]/pow(10,d);
d=0;
flad=0;
}
display.write(key);
display.display();
op[o] = 6;
o++;
fla=1;
break;
case '=':
display.print(" =");
display.display();
display.drawLine( 0, 46, 128, 46, SSD1306_WHITE );
display.setCursor(0,48);
if(n==0 && o==0){
display.print("Enter something");
display.display();
goto againe;
}
if(o!=n-1 || flai){
display.write("Invalid syntax");
display.display();
goto againe;
}
if(flad){
state[n-1]=d;
num[n-1]=num[n-1]/pow(10,d);
d=0;
flad=0;
}
i=o;
for(;;){
if(i==0) break;
else{
int max=0, ind=-1;
for(int h=0;h<i;h++){
if(op[h]>max){
max=op[h];
ind=h;
}
}
switch(op[ind]){
case 1:
num[ind]=num[ind]+num[ind+1];
break;
case 2:
num[ind]=num[ind]-num[ind+1];
break;
case 3:
num[ind]=num[ind]*num[ind+1];
break;
case 4:
num[ind]=pow(num[ind],num[ind+1]);
break;
case 5:
if(num[ind+1]==0){
display.write("Wrong Input");
display.display();
goto againe;
}
num[ind]=num[ind]/num[ind+1];
break;
case 6:
if(num[ind+1]==0){
display.write("Wrong Input");
display.display();
goto againe;
}
num[ind]=int(num[ind])%int(num[ind+1]);
break;
}
for(int h=ind+1;h<i+1;h++){
op[h-1]=op[h];
num[h]=num[h+1];
}
if(i==6){
op[5]=0;
num[5]=0;
}
i--;
}
}
numa=String(num[0],5);
display.println(numa);
display.display();
ans=num[0];
againe:
clearall();
break;
case 'C':
clearall();
display.display();
break;
case 'A':
display.write("Ans");
display.display();
num[n]=ans;
state[n]=-2;
ans1=0;
n++;
break;
case 'P':
clearall();
display.setTextSize(2);
display.println("Is Prime?");
display.drawLine( 0, 17, 128, 17, SSD1306_WHITE );
display.display();
display.setCursor(0,21);
enumber();
display.setTextSize(2);
clearall();
break;
case 'E':
display.print("e");
display.display();
num[n]=M_E;
state[n]=-3;
n++;
ans1=0;
break;
case 'I':
display.print("pi");
display.display();
num[n]=M_PI;
state[n]=-4;
n++;
ans1=0;
break;
case '.':
if(flad) flai=1;
flad=1;
d=0;
display.write(key);
display.display();
break;
case 'B':
if(flad){
state[n-1]=d;
num[n-1]=num[n-1]/pow(10,d);
d=0;
flad=0;
}
display.clearDisplay();
display.setCursor(0, 0);
if(o>=n){
int k=0;
o--;
op[o]=0;
for(k=0;k<n;k++){
switch(state[k]){
case 0:
numa=String(num[k],0);
display.print(numa);
break;
case -2:
display.print("Ans");
break;
case -3:
display.print("e");
break;
case -4:
display.print("pi");
break;
default:
numa=String(num[k],state[k]);
display.print(numa);
break;
}
switch(op[k]){
case 1:
display.write("+");
break;
case 2:
display.write("-");
break;
case 3:
display.write("X");
break;
case 4:
display.write("^");
break;
case 5:
display.write("/");
break;
case 6:
display.write("%");
break;
}
}
for(;k<o;k++){
switch(op[k]){
case 1:
display.write("+");
break;
case 2:
display.write("-");
break;
case 3:
display.write("X");
break;
case 4:
display.write("^");
break;
case 5:
display.write("/");
break;
case 6:
display.write("%");
break;
}
}
}
else{
n--;
for(int k=0;k<n;k++){
switch(state[k]){
case 0:
numa=String(num[k],0);
display.print(numa);
break;
case -2:
display.print("Ans");
break;
case -3:
display.print("e");
break;
case -4:
display.print("pi");
break;
default:
numa=String(num[k],state[k]);
display.print(numa);
break;
}
switch(op[k]){
case 1:
display.write("+");
break;
case 2:
display.write("-");
break;
case 3:
display.write("X");
break;
case 4:
display.write("^");
break;
case 5:
display.write("/");
break;
case 6:
display.write("%");
break;
}
}
if(state[n]==0){
numa=String(num[n],0);
numa=numa.substring(0,numa.length()-1);
num[n]=numa.toDouble();
if(num[n]!=0){
display.print(numa);
}
else{
fla=1;
n--;
}
}
else if(state[n]>0){
numa=String(num[n],state[n]);
state[n]--;
d=state[n];
numa=numa.substring(0,numa.length()-1);
num[n]=numa.toDouble()*pow(10,d);
display.print(numa);
if(state[n]!=-1) flad=1;
}
else{
num[n]=0;
state[n]=0;
n--;
fla=1;
}
n++;
}
display.display();
break;
}
}
void clearall(){
for(int jl=0;jl<max_size;jl++){
num[jl]=0;
op[jl]=0;
state[jl]=0;
}
i=0;
o=0;
ans1=1;
n=0;
fla=1;
flai=0;
flad=0;
d=0;
display.setCursor(0,0);
display.clearDisplay();
}
void enumber(){
for(;;){
key = customKeypad.getKey();
switch(key)
{
case '0' ... '9':
display.write(key);
display.display();
num[0] = num[0]*10 + (key - '0');
ans1=0;
break;
case 'A':
num[0]=ans;
case'=':
display.setTextSize(1);
display.setCursor(0,46);
display.drawLine( 0, 44, 128, 44, SSD1306_WHITE );
double l1=0;
if(int(num[0])&1){
for(double k=3;;k=k+2){
l1=k*k;
if(l1>num[0]){
numa=String(num[0],0);
display.print(numa);
display.println(" is Prime");
display.display();
break;
}
else if(int(num[0])%int(k)==0){
numa=String(num[0],0);
display.print(numa);
display.println(" is Composite");
numa=String(k,0);
display.print(numa);
display.println(" is a factor");
ans=k;
display.display();
break;
}
}
}
else if(num[0]==2){
numa=String(num[0],0);
display.print(numa);
display.println(" is Prime");
display.display();
}
else{
int k=2;
numa=String(num[0],0);
display.print(numa);
display.println(" is Composite");
numa=String(k,0);
display.print(numa);
display.println(" is a factor");
ans=k;
display.display();
}
return;
}
}
}