How to add counter to every if of my simple code

Question

            #include <stdio.h>
            #include <stdlib.h>
            int main()
            {
                float x,y;
                char k;
                do{
                printf("Este Programa indica o quadrante no plano cartesiano\n");
                printf("Entre com o valor de x:");
                scanf("%f",&x);
                printf("Entre com o valor de y:");
                scanf("%f",&y);
                if((x>0)&&(y>0))
                printf("O Ponto P(%.2f,%.2f) pertence ao primeiro Quadrante\n",x,y);
                else
                {
                  if((x<0)&&(y>0))
                  printf("O Ponto P(%.2f.%.2f) pertence ao segundo Quadrante\n",x,y);
                  else
                  {
                    if((x<0)&&(y<0))
                    printf("O Ponto P(%.2f,%.2f) pertence ao terceiro Quadrante\n",x,y);
                    else
                    {
                      if((x>0)&&(y<0))
                      printf("O Ponto P(%.2f,%.2f) pertence ao quarto Quadrante\n",x,y);
                      else
                      {
                        if((x==0)&&((y>0||y<0)))
                        printf("O Ponto P(%.2f,%.2f) esta no eixo y\n",x,y);
                        else
                        {
                          if((y==0)&&((x>0||x<0)))
                          printf("O Ponto P(%.2f,%.2f) esta no eixo x\n",x,y);
                          else
                          {
                            if((x==0)&&(y==0))
                            printf("O Ponto P(%.2f,%.2f) esta na origem\n\n",x,y);

                fflush(stdin);
                printf("\nDeseja digitar outro ponto. (S)/(N):\n");
                scanf("%c",&k);
                }while((k=='S')||(k=='s'));
            system("Pause");

I would like to implement in this code a counter and then write the points totals in each of the situations. For example, "Total points on the x-axis: ". However, I’m not getting it for some reason. If anyone can give a hint, thank you.

Answer 1

You haven’t explained exactly why you’re not succeeding, so I’ll tell you a little bit about the problems I’ve encountered and come up with a simple solution.

The first thing is indentation. When you have a lot of if/elseSo put it this way:

if (condicao1) {
    // código
} else if (condicao2) {
    // código
} else if (condicao3) {
   // código
}

So you avoid nesting randomly blocks that are not logically inside each other and still makes it easy to read.

With the indentation fixed and some adjustments that I comment next, it was like this:

#include <stdio.h>

int main() {
    char k;

    int qtdDePontosNoEixoX = 0;
    int qtdDePontosNoEixoY = 0;

    do {
        printf("Este Programa indica o quadrante no plano cartesiano\n");
        printf("Entre com o valor de x:");
        float x;
        scanf("%f",&x);
        printf("Entre com o valor de y:");
        float y;
        scanf("%f",&y);

        if((x>0)&&(y>0)) {
            printf("O Ponto P(%.2f,%.2f) pertence ao primeiro Quadrante\n",x,y);
        } else if((x<0)&&(y>0)) {                    
            printf("O Ponto P(%.2f.%.2f) pertence ao segundo Quadrante\n",x,y);
        } else if((x<0)&&(y<0)) {
            printf("O Ponto P(%.2f,%.2f) pertence ao terceiro Quadrante\n",x,y);
        } else if((x>0)&&(y<0)) {
            printf("O Ponto P(%.2f,%.2f) pertence ao quarto Quadrante\n",x,y);
        } else if((x==0)&&((y>0||y<0))) {
            printf("O Ponto P(%.2f,%.2f) esta no eixo y\n",x,y);
            qtdDePontosNoEixoY++;
        } else if((y==0)&&((x>0||x<0))) {
            printf("O Ponto P(%.2f,%.2f) esta no eixo x\n",x,y);
            qtdDePontosNoEixoX++;
        } else if((x==0)&&(y==0)) {
            qtdDePontosNoEixoX++;
            qtdDePontosNoEixoY++;
            printf("O Ponto P(%.2f,%.2f) esta na origem\n\n",x,y);
        }

        printf("\nDeseja digitar outro ponto. (S)/(N):\n");
        getchar(); // lendo e jogando fora a quebra de linha que fica na entrada por causa do Enter
        k = getchar();
    } while(k=='S' || k=='s');

    printf("%d dos pontos que você digitou estavam no eixo X e %d estavam no eixo Y\n", 
              qtdDePontosNoEixoX, qtdDePontosNoEixoY);

}

I removed the #include <stdlib.h>, that is not being used. It is interesting to know what you include and why, not to add something to your executable.

I moved the variables declaration x and y close to their respective scanf. Try to declare your variables always near where you are using them. So you avoid polluting a namespace larger than you need and having to keep going up and down the code to find out the type of variables or their initial value.

I removed the fflush(stdin). The function fflush only serves for flows of exit. For input flows she has the undefined behavior. I put a simple getchar() to read this Enter and throw it away and that’s enough for this simple case (if we’re going to start making production-level error checks, we’d have to tinker with a lot more stuff).

As for the solution, after organizing the code, it is very easy to see where you have to move: only create two variables, one for each axis, initialize with 0 and increment in 1 in the appropriate cases.