如何获取具有结构指针的结构字段？

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

typedef struct {
    int field1;
    char field2;
    float field3;
} MyStruct;

int main() {
    MyStruct *ptr;
    ptr = (MyStruct*)malloc(sizeof(MyStruct));
    
    ptr->field1 = 10;
    ptr->field2 = 'a';
    ptr->field3 = 3.14;
    
    printf("field1: %d\n", ptr->field1);
    printf("field2: %c\n", ptr->field2);
    printf("field3: %.2f\n", ptr->field3);
    
    free(ptr);
    return 0;
}