How to access a pointer within a structure?

Question

I need to know how to access the first position of the pointer vector *c_parte_real, as shown below:

typedef struct{

   struct char_vector{
      char *c_parte_real[2], *c_parte_imag[2];
   }c_vector;

   struct int_vector{
      int *i_parte_real[2], *i_parte_imag[2];
   }i_vector;

   struct complex_num{
      float real1,real2,imag1,imag2;
   }comp_num;

}expressao_complexa;

Answer 1

Assuming you declare a variable x, of the kind expressao_complexa, access can be made directly:

...
expressao_complexa x;

// atribui um valor
x.c_vector.c_parte_real[0] = "1.0"; 

// imprime o valor atribuído
printf("%s\n", x.c_vector.c_parte_real[0]); 
...

Answer 2

I gave a simplified to be clearer, I created a variable to receive the position value

#include "stdio.h"

int main(void) {


typedef struct char_vector{
char *c_parte_real[2], *c_parte_imag[2];
}c_vector;



char  a,b;//variável que recebe o valor
c_vector x;

x.c_parte_real[0]='2';
a = x.c_parte_real[0];

x.c_parte_real[1]='3';
b = x.c_parte_real[1];

printf("a=%c\n",a);//imprime na tela
printf("b=%c\n",b);//imprime na tela

return 0;
}

test on :https://repl.it/languages/c

Answer 3

The above answers are correct, but your code is wrong, you cannot declare structures within structure statements. What you can do is have structures as components of structure statements.