File content as of revision 0:f8d011978c8d:

#include "mbed.h"
#include "uLCD_4DGL.h"
#include <iostream>
#include <math.h>
#include <cmath>
#include <string>
#include <cstring>
#include <list>
#include <vector>
#include <mpr121.h>
Serial pc(USBTX, USBRX);
using namespace std;
//
uLCD_4DGL uLCD(p13, p14, p11);
InterruptIn interrupt(p26);
InterruptIn interrupt2(p25);
I2C i2c(p9, p10);
I2C i2c2(p28, p27);
//
Mpr121 numpad(&i2c, Mpr121::ADD_VSS);
Mpr121 operpad(&i2c2, Mpr121::ADD_VSS);

int fallInterrupt() 
{
     int num = numpad.read(0x00);
     num +=numpad.read(0x01)<<8;
     int i=0;
     i = 0;
     for (i=0; i<12; i++) {
        if (num & (1<<i))
        break;
     }
     if(i == 0) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
     }
     else if (i == 1) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
     }
     else if (i == 2) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
         }
     else if (i == 3) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
         }
     else if (i == 4) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
         }
     else if (i == 5) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
         }
     else if (i == 6) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
         }
     else if (i == 7) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
         }
     else if (i == 8) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
         }
     else if (i == 9) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("%d", i);
         }
     else if (i == 10) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf(".");
         }
     else if (i == 11) {
        uLCD.text_width(2); //4X size text
        uLCD.text_height(2);
        uLCD.color(BLUE);
        uLCD.printf("-");
         }
//        pc.printf("%d", i);
    return i;
}

int fallInterrupt2() 
{
     int num = operpad.read(0x00);
     num +=operpad.read(0x01)<<8;
     int i =0;
     i = 0;
     for (i=0; i<12; i++) {
        if (num & (1<<i))
        break;
     }
     if(i == 1) {
        uLCD.printf("+");
     }
     else if (i == 2) {
        uLCD.printf("-");
     }
     else if (i == 3) {
         uLCD.printf("*");
         }
     else if (i == 4) {
         uLCD.printf("/");
    }
//    else if (i == 4) {
//         uLCD.printf("/");
//         }
     else if (i == 5) {
         uLCD.color(RED);
         uLCD.printf("\n=");
     }
     else if (i == 6) {
         uLCD.cls();
    }
    return i;
}

int main() {
    while (1) {
//  C;
//  interrupt2.fall(&fallInterrupt2);
//  interrupt.fall(&fallInterrupt);
//  interrupt.mode(PullUp);
//  interrupt2.mode(PullUp);
  float temp = 0;
  float temp1 = 0;
  int temp2 = 0;
  float temp3 = 0;
  int temp4 = 0;
  float temp5 = 0;
  int temp6 = 0;
  int count = 1;
  int count2 = 1;
  int count3 = 1;
  int fans = 10;
  int fans2 = 10;
  int fans3 = 10;
  int negate = 0;
  while (1) {
         int oper1 = operpad.read(0x00);
         oper1 +=operpad.read(0x01)<<8;
         int num1 = numpad.read(0x00);
         num1 +=numpad.read(0x01)<<8;
//         temp2 = fallInterrupt2();
//         wait(0.1);
         if (oper1){
//             wait(0.3);
            int ope = fallInterrupt2();
            wait(0.2);
            if (ope == 0) {
                uLCD.cls();
                uLCD.printf("Cleared");
                wait(0.5);
                uLCD.cls();
                count = 1;
                temp1 = 0;
                temp2 = 0;
                fans = 10;
            }
            else{
                temp2 = ope;
                break;
             }
         }
         else if (num1){
                int ans = fallInterrupt();
                wait(0.2);
                if (ans == 10) {
                    count = count +1;
//                    pc.printf("hi I am in ans==10");
//                    pc.printf("hi count from ans ==10 is %d\n", count);
                    }
                else if (ans == 11) {
                    negate = 1;
                    }
                else {
                    if (count == 2) {
                        if (negate == 1){
//                        pc.printf("ans = %d\n", ans);
//                        pc.printf("count = %d\n", count);
//                        pc.printf("temp1 before = %0.2f\n", temp1);
                            temp1 = temp1 *10;
                            temp1 = (temp1 - ans)/10;
                            temp1 = temp1;
//                        pc.printf("temp1 after = %0.2f\n", temp1);
                             count = count +1;
                            fans = fans * 10;
                        }
                        else{
                            temp1 = temp1 *10;
                            temp1 = (temp1 + ans)/10;
//                        pc.printf("temp1 after = %0.2f\n", temp1);
                            count = count +1;
                            fans = fans * 10;
                        }
                    }
//                        wait(0.3);
                    else if (count > 2) {
                        if (negate == 1){
                            temp1 = temp1 * fans;
                            temp1 = temp1 - ans;
//                        pc.printf("ans = %d\n", ans);
                            temp1 = temp1/fans;
                            temp1 = temp1;
//                        pc.printf("temp1 after = %0.2f\n", temp1);
                            fans = fans * 10;
                        }
                        else{
                            temp1 = temp1 * fans;
                            temp1 = temp1 + ans;
//                        pc.printf("ans = %d\n", ans);
                            temp1 = temp1/fans;
//                        pc.printf("temp1 after = %0.2f\n", temp1);
                            fans = fans * 10;
                        }    
                    }
                    else if(count==1){
                        if (negate == 1){
                            temp1 = temp1 * 10;
                            temp1 = temp1 - ans;
                            temp1 = temp1;
                        pc.printf("temp1 = %d\n", temp1);
                        pc.printf("count = %d\n", count);
                        }
                        else {
                            temp1 = temp1 * 10;
                            temp1 = temp1 + ans;
                        }
                   }
//                    wait(0.3);
                }
        wait(0.2);
        }
    }
    while (1) {
         int oper2 = operpad.read(0x00);
         oper2 +=operpad.read(0x01)<<8;
         int num2 = numpad.read(0x00);
         num2 +=numpad.read(0x01)<<8;
//         temp4 = fallInterrupt2();
//         wait(0.1);
         if (oper2){
//             wait(0.3);
            int ope = fallInterrupt2();
            wait(0.2);
            if (ope == 0) {
                uLCD.cls();
                uLCD.printf("Cleared");
                wait(0.5);
                uLCD.cls();
                count2 = 1;
                temp3 = 0;
                temp4 = 0;
                fans2 = 10;
            }
            else{
                temp4 = ope;
                break;
             }
         }
         else if (num2){
                int ans = fallInterrupt();
                wait(0.2);
                if (ans == 10) {
                    count2 = count2 +1;
//                    pc.printf("hi I am in ans==10");
//                    pc.printf("hi count from ans ==10 is %d\n", count);
                    }
                else {
                    if (count2 == 2) {
//                        pc.printf("ans = %d\n", ans);
//                        pc.printf("count = %d\n", count2);
//                        pc.printf("temp1 before = %0.2f\n", temp3);
                        temp3 = temp3 *10;
                        temp3 = (temp3+ans)/10;
//                        pc.printf("temp1 after = %0.2f\n", temp3);
                        count2 = count2 +1;
                        fans2 = fans2 * 10;
                        }
//                        wait(0.3);
                    else if (count2 > 2) {
                        temp3 = temp3 * fans2;
                        temp3 = temp3 + ans;
//                        pc.printf("ans = %d\n", ans);
                        temp3 = temp3/fans2;
//                        pc.printf("temp1 after = %0.2f\n", temp1);
                        fans2 = fans2 * 10;
                        }
                    else if(count2==1){
                        temp3 = temp3 * 10;
                        temp3 = temp3 + ans;
//                        pc.printf("temp1 = %d\n", temp1);
//                        pc.printf("count = %d\n", count);
                        }
                    }
//                    wait(0.3);
                }
        wait(0.2);
       }
    while (1) {
        int oper3 = operpad.read(0x00);
         oper3 +=operpad.read(0x01)<<8;
         int num3 = numpad.read(0x00);
         num3 +=numpad.read(0x01)<<8;
//         temp6 = fallInterrupt2();
//         wait(0.1);
         if (oper3){
//             wait(0.3);
            int ope = fallInterrupt2();
            wait(0.2);
            if (ope == 0) {
                uLCD.cls();
                uLCD.printf("Cleared");
                wait(0.5);
                uLCD.cls();
                count3 = 1;
                temp5 = 0;
                temp6 = 0;
                fans3 = 10;
            }
            else{
                temp6 = ope;
                break;
             }
         }
         else if (num3){
                int ans = fallInterrupt();
                wait(0.2);
                if (ans == 10) {
                    count3 = count3 +1;
//                    pc.printf("hi I am in ans==10");
//                    pc.printf("hi count from ans ==10 is %d\n", count);
                    }
                else {
                    if (count3 == 2) {
//                        pc.printf("ans = %d\n", ans);
//                        pc.printf("count = %d\n", count3);
//                        pc.printf("temp1 before = %0.2f\n", temp5);
                        temp5 = temp5 *10;
                        temp5 = (temp5+ans)/10;
//                        pc.printf("temp1 after = %0.2f\n", temp5);
                        count3 = count3 +1;
                        }
//                        wait(0.3);
                    else if (count3 > 2) {
                        temp5 = temp5 * fans3;
                        temp5 = temp5 + ans;
//                        pc.printf("ans = %d\n", ans);
                        temp5 = temp5/fans3;
//                        pc.printf("temp1 after = %0.2f\n", temp1);
                        fans3 = fans3 * 10;
                        }
                    else if(count3==1){
                        temp5 = temp5 * 10;
                        temp5 = temp5 + ans;
//                        pc.printf("temp1 = %d\n", temp1);
//                        pc.printf("count = %d\n", count);
                        }
                    }
//                    wait(0.3);
                }
        wait(0.2);
       }
       if ((temp2 == 1) && (temp4 == 1)){
                temp = temp1 + temp3 + temp5;
                pc.printf("temp is %0.2f\n", temp);
           }
       else if ((temp2 == 1) && (temp4 == 2)){
                temp = temp1 + temp3 - temp5;
           }
       else if ((temp2 == 1) && (temp4 == 3)){
                temp = temp1 + (temp3 * temp5);
           }
       else if ((temp2 == 1) && (temp4 == 4)){
                temp = temp1 + (temp3 / temp5);
           }
       else if ((temp2 == 2) && (temp4 == 1)){
                temp = temp1 - temp3 + temp5;
        }
       else if ((temp2 == 2) && (temp4 == 2)){
                temp = temp1 - temp3 - temp5;
        }
       else if ((temp2 == 2) && (temp4 == 3)){
                temp = temp1 - (temp3 * temp5);
           }
       else if ((temp2 == 2) && (temp4 == 4)){
                temp = temp1 - (temp3 / temp5);
           }
       else if ((temp2 == 3) && (temp4 == 1)){
                temp = temp1 * temp3 + temp5;
        }
       else if ((temp2 == 3) && (temp4 == 2)){
                temp = temp1 * temp3 - temp5;
        }
       else if ((temp2 == 3) && (temp4 == 3)){
                temp = temp1 * temp3 * temp5;
        }
       else if ((temp2 == 3) && (temp4 == 4)){
                temp = temp1 * temp3 / temp5;
        }
       else if ((temp2 == 4) && (temp4 == 1)){
                temp = temp1 / temp3 + temp5;
        }
       else if ((temp2 == 4) && (temp4 == 2)){
                temp = temp1 / temp3 - temp5;
        }
       else if ((temp2 == 4) && (temp4 == 3)){
                temp = temp1 / temp3 * temp5;
        }
       else if ((temp2 == 4) && (temp4 == 4)){
                temp = temp1 / temp3 / temp5;
        }
        else{
            uLCD.printf("Error");
            }
        
 uLCD.color(RED);
 uLCD.printf("%0.2f\n", temp);

  }
  }