为结构内的 C 字符串分配内存

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

typedef struct {
    char *str;
} StringStruct;

int main() {
    StringStruct str_struct;
    str_struct.str = (char *) malloc(100 * sizeof(char));
    strcpy(str_struct.str, "Hello, World!");
    printf("String: %s\n", str_struct.str);
    free(str_struct.str);
    return 0;
}

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

typedef struct {
    char *str;
} StringStruct;

int main() {
    StringStruct str_struct;
    str_struct.str = (char *) calloc(100, sizeof(char));
    strcpy(str_struct.str, "Hello, World!");
    printf("String: %s\n", str_struct.str);
    free(str_struct.str);
    return 0;
}

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

typedef struct {
    char *str;
} StringStruct;

int main() {
    StringStruct str_struct;
    str_struct.str = strdup("Hello, World!");
    printf("String: %s\n", str_struct.str);
    free(str_struct.str);
    return 0;
}

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

typedef struct {
    char *str;
} StringStruct;

int main() {
    StringStruct str_struct;
    str_struct.str = (char *) malloc(100 * sizeof(char));
    strcpy(str_struct.str, "Hello, World!");
    printf("String: %s\n", str_struct.str);
    free(str_struct.str);
    return 0;
}