stack, C (gcc) - rextester

stack

//gcc 5.4.0

#include  <stdio.h>
#include <stdlib.h>
#include <math.h>

typedef struct nodo{
       char tipo;
        int posX;
        int posY;
        struct nodo* pnext;
}Nodo;

void push(Nodo** ppstack, char valor, int x, int y){
    Nodo *ptr = malloc(sizeof(Nodo));
    
    ptr->tipo = valor;
    ptr->posX = x;
    ptr->posY = y;
    ptr->pnext = *ppstack;
    *ppstack = ptr;
    
}
            
void pop(Nodo** pptrStack){
    Nodo *tmp = *pptrStack;
    *pptrStack = (*pptrStack)->pnext;
    free(tmp);
}
          
 void Scan( char m[3][3],Nodo** pstack){
    
    for ( int i= 0; i<3;i++){
        for (int j=0; j<3;j++){
            if( m[i][j] == 'X' || m[i][j] == 'O'){
                push(pstack,m[i][j],i+1,j+1);
            }
        }
    }
}

int main(void)
{
    Nodo *ptrStack = NULL;
    
    char m[3][3] = {{'X',' ', 'X'},{' ', 'O',' '},{'O','O',' '}};
    Scan(m, &ptrStack);
    Nodo* paux = ptrStack;
    printf("%p",ptrStack);
    while(paux != NULL){
        printf("{%c,%d,%d}",paux->tipo,paux->posX,paux->posY);
        paux = paux->pnext;
    }

return 0;
}


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