Thread: Calculator using mouse, need help with a bug while dragging the mouse

Hi, I have an assignment to do a calculator in C, wich will work by clicking the numbers with the mouse, however i have a bug that when i hold the mouse and dragg it, it assumes that I'm clicking multiple times, also, when I click in an empty space the program creates a blank space on the calculator screen.
I would really like some help on that, here goes the code:

Code:

#include <stdio.h>
#include <conio.h>
#include <math.h>
#include "..\MouseHandler.h" // ajustar o caminho ao seu projecto
#include "..\calcSkinLib.h"  // ajustar o caminho ao seu projecto
#define PI = 3.1415;








char tecla(struct mouseClick evento, HANDLE wHnd);




int main(int argc, char *argv[]) {
    HANDLE rHnd, wHnd;  //Handles for reading and writing to the console.
    struct mouseClick evento;




    if (!initializeControls(&rHnd, &wHnd)) {    //must call before doing anything
        printf("ERROR WHILE INITIALIZING\n"); //if couldn't initialize
        exit(0);
    }


    printCalcMask(wHnd);
    locate(79, 24, wHnd); printf("\xb2");
    locate(0, 0, wHnd); printf("        clique em no ecr\xc6 (em [24, 79] para encerrar)");


    do {


        char num1[20]; char opr;
        double n1 = 0; double n2 = 0; double rslt = 0;
        char mClick;
        int l1 = 0;


        
        do{


            evento = readMouse(rHnd);
            locate(0, 0, wHnd);
            mClick = tecla(evento, wHnd);


            locate(25 + l1, 6, wHnd);
            switch (mClick){
            case '0':num1[l1] = '0'; /*locate(35 + l1, 6, wHnd);*/ printf("0"); break;
            case '1':num1[l1] = '1'; /*locate(35 + l1, 6, wHnd);*/ printf("1"); break;
            case '2':num1[l1] = '2'; /*locate(35 + l1, 6, wHnd);*/ printf("2"); break;
            case '3':num1[l1] = '3'; /*locate(35 + l1, 6, wHnd);*/ printf("3"); break;
            case '.':num1[l1] = '.'; /*locate(35 + l1, 6, wHnd);*/ printf("."); break;
            case '4':num1[l1] = '4'; /*locate(35 + l1, 6, wHnd);*/ printf("4"); break;
            case '5':num1[l1] = '5'; /*locate(35 + l1, 6, wHnd);*/ printf("5"); break;
            case '6':num1[l1] = '6'; /*locate(35 + l1, 6, wHnd);*/ printf("6"); break;
            case '7':num1[l1] = '7'; /*locate(35 + l1, 6, wHnd);*/ printf("7"); break;
            case '8':num1[l1] = '8'; /*locate(35 + l1, 6, wHnd);*/ printf("8"); break;
            case '9':num1[l1] = '9'; /*locate(35 + l1, 6, wHnd);*/ printf("9"); break;
            case 'C':for (int j = 0; j <= 20; j++){ num1[j] = ' '; }l1 = 0; n1 = 0; n2 = 0; locate(25, 6, wHnd); printf("\t\t\t     "); break;
            case 'p':num1[0] = '3'; num1[1] = '.'; num1[2] = '1'; num1[3] = '4'; num1[4] = '1'; num1[5] = '5';
                locate(25, 6, wHnd); printf("\t\t\t"); locate(25 + l1, 6, wHnd); printf(" pi"); l1 = 0; break;




            case '-':{ opr = '-'; locate(25, 6, wHnd); printf("\t\t\t     ");
                if (n2 == 0) {
                    n2 = n1;
                    for (int j = 0; j <= 20; j++){
                        num1[j] = ' ';
                    }
                }


                l1 = 0; } break;




            case '+':{ opr = '+'; locate(25, 6, wHnd); printf("\t\t\t     ");
                if (n2 == 0) {
                    n2 = n1;
                    for (int j = 0; j <= 20; j++){
                        num1[j] = ' ';
                    }
                }
                


                l1 = 0; } break;






            case '*':{ opr = '*'; locate(25, 6, wHnd); printf("\t\t\t     ");
                if (n2 == 0) {
                    n2 = n1;
                    for (int j = 0; j <= 20; j++){
                        num1[j] = ' ';
                    }
                }


                l1 = 0; } break;


            case '/':{ opr = '/'; locate(25, 6, wHnd); printf("\t\t\t     ");
                if (n2 == 0) {
                    n2 = n1;
                    for (int j = 0; j <= 20; j++){
                        num1[j] = ' ';
                    }
                }


                l1 = 0; } break;








            case '=':


                switch (opr){


                case '+':locate(25, 6, wHnd); printf("\t\t\t"); locate(25, 6, wHnd); n2 += n1; printf("%.4f", n2);
                    for (int j = 0; j <= 20; j++){ num1[j] = ' '; }l1 = 0; break;


                case '-':locate(25, 6, wHnd); printf("\t\t\t"); locate(25, 6, wHnd); n2 = n2 - n1; printf("%.4f", n2); l1 = 0;
                    for (int j = 0; j <= 20; j++){ num1[j] = ' '; } break;


                case '*':locate(25, 6, wHnd); printf("\t\t\t"); locate(25, 6, wHnd); n2 = n2 * n1; printf("%.4f", n2); l1 = 0;
                    for (int j = 0; j <= 20; j++){ num1[j] = ' '; } break;


                case '/':locate(25, 6, wHnd); printf("\t\t\t"); locate(25, 6, wHnd); n2 = n2 / n1; printf("%.4f", n2); l1 = 0;
                    for (int j = 0; j <= 20; j++){ num1[j] = ' '; } break;
                }




                //if (opr == '+'){ locate(36, 6, wHnd); printf("\t\t"); locate(36, 3, wHnd); n2+=n1; printf("%.4f",n2); }
                //    else if (opr == '-'){ locate(36, 6, wHnd); printf("\t\t"); locate(36, 3, wHnd); n2 =n2- n1; printf("%.4f", n2); }






            }//switch




            
            if
                (l1 <= 15)
            {
                l1++;
            }
            n1 = atof(num1);
        } while (!(mClick == 'o'));














    } while (!(evento.xPos == 79 && evento.yPos == 24));
    locate(0, 1, wHnd);
    printf("Pressione uma tecla para fechar...\x07"); _getch();
    return EXIT_SUCCESS;
}
char tecla(struct mouseClick evento, HANDLE wHnd){
    if (evento.xPos >= 30 && evento.xPos <= 32 && evento.yPos == 10) return 'x'; //exit
    if (evento.xPos >= 35 && evento.xPos <= 37 && evento.yPos == 10) return 'f';//fix
    if (evento.xPos >= 39 && evento.xPos <= 41 && evento.yPos == 10) return 'b';//back
    if (evento.xPos >= 44 && evento.xPos <= 47 && evento.yPos == 10) return 'c';//ce
    if (evento.xPos >= 49 && evento.xPos <= 51 && evento.yPos == 10) return 'C';//c
    if (evento.xPos >= 26 && evento.xPos <= 28 && evento.yPos == 12) return 'i';//inv
    if (evento.xPos >= 30 && evento.xPos <= 32 && evento.yPos == 12) return 's';//sin
    if (evento.xPos >= 34 && evento.xPos <= 36 && evento.yPos == 12) return 'o';//cos
    if (evento.xPos >= 38 && evento.xPos <= 40 && evento.yPos == 12) return 't';//tan
    if (evento.xPos >= 42 && evento.xPos <= 43 && evento.yPos == 12) return 'n';//ln
    if (evento.xPos >= 45 && evento.xPos <= 47 && evento.yPos == 12) return 'l';//log
    if (evento.xPos >= 49 && evento.xPos <= 51 && evento.yPos == 12) return 'e';//exp
    if (evento.xPos >= 26 && evento.xPos <= 28 && evento.yPos == 14) return '7';//7
    if (evento.xPos >= 30 && evento.xPos <= 32 && evento.yPos == 14) return '8';//8
    if (evento.xPos >= 34 && evento.xPos <= 36 && evento.yPos == 14) return '9';//9
    if (evento.xPos >= 38 && evento.xPos <= 40 && evento.yPos == 14) return '/';// /
    if (evento.xPos >= 42 && evento.xPos <= 45 && evento.yPos == 14) return 'm';// mc
    if (evento.xPos >= 47 && evento.xPos <= 51 && evento.yPos == 14) return 'q';//raiz
    if (evento.xPos >= 26 && evento.xPos <= 28 && evento.yPos == 16) return '4';//4
    if (evento.xPos >= 30 && evento.xPos <= 32 && evento.yPos == 16) return '5';//5
    if (evento.xPos >= 34 && evento.xPos <= 36 && evento.yPos == 16) return '6';//6
    if (evento.xPos >= 38 && evento.xPos <= 40 && evento.yPos == 16) return '*';//*
    if (evento.xPos >= 42 && evento.xPos <= 44 && evento.yPos == 16) return 'M';//mr
    if (evento.xPos >= 47 && evento.xPos <= 49 && evento.yPos == 16) return 'p';//pi
    if (evento.xPos >= 26 && evento.xPos <= 28 && evento.yPos == 18) return '1';//1
    if (evento.xPos >= 30 && evento.xPos <= 32 && evento.yPos == 18) return '2';//2
    if (evento.xPos >= 34 && evento.xPos <= 36 && evento.yPos == 18) return '3';//3
    if (evento.xPos >= 38 && evento.xPos <= 40 && evento.yPos == 18) return '-';//-
    if (evento.xPos >= 42 && evento.xPos <= 45 && evento.yPos == 18) return '&';//ms
    if (evento.xPos >= 47 && evento.xPos <= 51 && evento.yPos == 18) return 'r';//rad
    if (evento.xPos >= 26 && evento.xPos <= 28 && evento.yPos == 20) return '.';// .
    if (evento.xPos >= 30 && evento.xPos <= 32 && evento.yPos == 20) return '0';//0
    if (evento.xPos >= 34 && evento.xPos <= 36 && evento.yPos == 20) return '=';// =
    if (evento.xPos >= 38 && evento.xPos <= 40 && evento.yPos == 20) return '+';// +
    if (evento.xPos >= 42 && evento.xPos <= 45 && evento.yPos == 20) return '#';//m+
    if (evento.xPos >= 47 && evento.xPos <= 51 && evento.yPos == 20) return 'd';//deg
}

Originally Posted by Salem

> char tecla(struct mouseClick evento, HANDLE wHnd);
Look in evento to see what the button states are.
Make tecla return a value when the button is pressed (or released).

Perhaps modify the function like so
char tecla(struct mouseClick evento, HANDLE wHnd, unsigned int *buttonStates);

Hi, thanks for replying, i'm not good programmer, i'm only in the beggining, I tried what you said but it didn't work, an error appeared: "Error 1 error C2660: 'tecla' : function does not take 2 arguments"
I think if I find a way for it to return a value only when the mouse is released that my problem is solved, but how do i do that?