struct ** Основы C работа с указателями

  parm *p[13];

for (i=0;i<10;i++){
                p = malloc(sizeof(parm));
                p[i]->col = i;
                p[i]->r_begin = rand()%5;
                p[i]->r_end = rand()%30;
        }

  parm *p[13];
        for (i=0;i<10;i++){
                p[i] = new parm; // malloc(sizeof(parm));
                p[i]->col = i;
                p[i]->r_begin = rand()%5;
                p[i]->r_end = rand()%30;
        } 

parm **p = new parm*[10];

  parm p[13];
        for (i=0;i<10;i++){
                p[i].col = i;
                p[i].r_begin = rand()%5;
                p[i].r_end = rand()%30;
        } 

struct parm {
        int col;
        int r_begin;
        int r_end;
};

struct parm p[13];

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

struct parm {
    int col;
    int r_begin;
    int r_end;
};

int main()
{
    // man malloc!
    struct parm *p = malloc(10 * sizeof(struct parm));

    for (int i = 0; i < 10; i++) {
        p[i].col = i;
        p[i].r_begin = rand() % 5;
        p[i].r_end = rand() % 30;
    }

    // ...

    for (int i = 0; i < 10; i++) {
        printf("p[%i] = {%i, %i, %i}\n", i, p[i].col, p[i].r_begin, p[i].r_end);
    }

    // ...

    free(p);

    return 0;
}

$ gcc -std=c99 -Wall -o rtfm rtfm.c
$ ./rtfm
p[0] = {0, 3, 16}
p[1] = {1, 2, 25}
p[2] = {2, 3, 25}
p[3] = {3, 1, 12}
p[4] = {4, 4, 1}
p[5] = {5, 2, 7}
p[6] = {6, 0, 19}
p[7] = {7, 3, 16}
p[8] = {8, 0, 6}
p[9] = {9, 2, 16}
$

struct parm {
        int col;
        int r_begin;
        int r_end;
};

vector < parm > p(10);
for (i=0;i<10;i++){
        p[i].col = i;
        p[i].r_begin = rand()%5;
        p[i].r_end = rand()%30;
}

typedef struct {
        int col;
        int r_begin;
        int r_end;
} parm;

parm p[10];
for (i=0;i<10;i++){
        p[i].col = i;
        p[i].r_begin = rand()%5;
        p[i].r_end = rand()%30;
}