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#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
 
typedef struct{
    int **array;
    int **pointers;
    int stacks_number;
    int size;
}Stacks_array;
 
void init_array(Stacks_array *array){
    // Ввод числа стеков
    int N;
    printf("\nType number of stacks: ");
    if ((scanf("%d", &N) == 0) || (N < 3)){
        printf("\nError.*\n ");
        exit(-1);
    }
    array->stacks_number = N;
    // Ввод начальных размеров стеков
    (*array->pointers) = (int**)malloc(sizeof(int*));
    array->pointers = (int*)malloc(sizeof(int)*N);
    array->pointers[0] = 0;
    for (int i = 0; i < N; i++) {
        int tmp;
        printf("\nType size of stack number %d: ", i);
        if ((scanf("%d", &tmp) == 0) || ( tmp < 2)) {
            printf("\nError. Try again.\n ");
            i--;
            continue;
        }
        array->pointers[i + 1] = array->pointers[i] + tmp;
        if (i != N - 1)
            array->size += tmp;
    }
    // Инициализация массива
    array->array = (int*) malloc(sizeof(int)*array->size);
}
 
int main() {
    Stacks_array array;
    init_array(&array);
    return 0;
}
    // Инициализация массива
    array->array = (int*) malloc(sizeof(int)*array->size);
}
 
int main() {
    Stacks_array array;
    init_array(&array);
    return 0;
}

prog.c: In function 'init_array':
prog.c:23:24: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
     (*array->pointers) = (int**)malloc(sizeof(int*));
                        ^
prog.c:24:21: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
     array->pointers = (int*)malloc(sizeof(int)*N);
                     ^
prog.c:39:18: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
     array->array = (int*) malloc(sizeof(int)*array->size);
                  ^
prog.c: At top level:
prog.c:48:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before '->' token
     array->array = (int*) malloc(sizeof(int)*array->size);
          ^
prog.c:49:1: error: expected identifier or '(' before '}' token
 }
 ^
prog.c:51:5: error: redefinition of 'main'
 int main() {
     ^
prog.c:42:5: note: previous definition of 'main' was here
 int main() {
     ^

Standard output is empty