snprintf不能使用"字符串指针"赋值,可以使用字符数组

Posted 2020-10-20 timer_go

#cat snprintf.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct student{
    int age;
    char *name;
};

int main(void)
{
    /*t1 结构体指针*/
    struct student *t1;
    t1 = malloc(sizeof(struct student));
    t1->age = 11;
    t1->name = "ahao.mah";

    /*t2 结构体变量*/
    struct student t2;
    t2.name = "jack";
    t2.age = 22;

    printf("t1:%s\n", t1->name);
    printf("t2:%s\n", t2.name);

    /*snprintf不能使用字符串指针赋值*/
    char *a;
    char *dev = t1->name;
    /*可以使用字符串数组*/
    //char dev[10];
    //strcpy(dev, t1->name);

    printf("dev:%s\n", dev);
    sprintf(a, "/dev/%s", dev);
    printf("a:%s\n", a);

    return 0;
}