从struct向量分配结构指针值

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

typedef struct {
    int id;
    char name[20];
} Person;

int main() {
    int numPersons = 3;
    Person* persons = (Person*)malloc(numPersons * sizeof(Person));

    if (persons == NULL) {
        printf("内存分配失败\n");
        return 1;
    }

    for (int i = 0; i < numPersons; i++) {
        persons[i].id = i + 1;
        sprintf(persons[i].name, "Person %d", i + 1);
    }

    for (int i = 0; i < numPersons; i++) {
        printf("Person %d: ID=%d, Name=%s\n", i + 1, persons[i].id, persons[i].name);
    }

    free(persons);

    return 0;
}