add

int A,B,C,D,E;
int x1, x2, x3, x4;//1 = +; 2 = -; 3 = *; 4 = /;
int Z = 8; //Result;
for (A=1; A<=9; A++) {
  for (B=1; B<=9; B++) {
    for (C=1; C<=9; C++) {
      for (D=1; D<=9; D++) {
        for (E=1; E<=9; E++) {
          for (x1=1; x1<=4; x1++) {
            for (x2=1; x2<=4; x2++) {
              for (x3=1; x3<=4; x3++) {
                for (x4=1; x4<=4; x4++) {
                    int cc [9] = {A,x1,B,x2,C,x3,D,x4,E};
                    r = check(cc, 9);
                    if (r == Z) {
                        printf("you got it, %d, %d, %d, %d, %d, %d, %d, %d, %d", A,x1,B,x2,C,x3,D,x4,E);
                    }
                }
              }
            }
          }
        }
      }
    }
  }
}

int check(int a[], int l)
{
    int b[l];
    for (int i = 0; i< l; i++) {
        b[i] = -1;
    }
    int c = 0;
    int cnt = 0;
    for (int i = 1; i < 8; i+= 2) {
        switch(i)
        {
            case 1:
            case 2:
                if (b[c] < 0)
                    b[c] = a[i-1];
                b[c+1] = a[i];
                //b[c+2] = a[i+1];
                c+= 2;
                break;
            case 3:
                b[c] = a[i-1] * a[i+1];
                cnt++;
                break;
            case 4:
                b[c] = b[c] / a[i+1];
                cnt++;
                break;
        }
    }
    if (cnt==0) {
        int r = 0;
        for (int i = 0; i < c; i++) {
            switch (i)
            {
                case 1:
                    b[i+1] += b[i-1];
                    break;
                case 2:
                    b[i+1] -= b[i-1];
                    break;
            }
            r = b[i+1];
        }
        return r;
    } else {
        return check(b, c);
    }
}