直接上代码，分别是栈上开辟内存，堆上开辟内存
1 #include2 #include 3 4 void test01(){ 5 char filename[100]; 6 7 printf("请输入视频路径：\n"); 8 scanf("%s", filename); 9 10 char *out_filename = malloc(sizeof(char)* 200);11 memset(out_filename, 0, sizeof(char)* 200);12 int pos = 0;13 for (int i = 0; i < strlen(filename) - 4; ++i){14 out_filename[pos++] = filename[i];15 }16 out_filename[pos] = '\0'; //不写\0会出现烫烫烫乱码17 strcat(out_filename, "_out.avi");18 printf("%s\n", out_filename);19 free(out_filename);20 out_filename = NULL;21 }22 23 void test02(){24 char filename[100];25 26 printf("请输入视频路径：\n");27 scanf("%s", filename);28 29 char tmp[100] = { 0 };30 int pos = 0;31 for (int i = 0; i < strlen(filename) - 4; ++i){32 tmp[pos++] = filename[i];33 }34 tmp[pos] = '\0'; //不写\0会出现烫烫烫乱码35 strcat(tmp, "_out.avi");36 37 printf("%s\n", tmp);38 }39 40 int main(){41 42 test01();43 test02();44 45 system("pause");46 return 0;47 }
如果是用指针来复制数组，不要用以下代码
char *out_filename = 0;
因为没有开辟内存，直接对指针自增会出现访问冲突
