C语言复制数组

直接上代码，分别是栈上开辟内存，堆上开辟内存

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

 void test01(){
     char filename[];

     printf("请输入视频路径：\n");
     scanf("%s", filename);

     char *out_filename = malloc(sizeof(char)* );
     memset(out_filename, , sizeof(char)* );
     int pos = ;
     for (int i = ; i < strlen(filename) - ; ++i){
         out_filename[pos++] = filename[i];
     }
     out_filename[pos] = '\0'; //不写\0会出现烫烫烫乱码
     strcat(out_filename, "_out.avi");
     printf("%s\n", out_filename);
     free(out_filename);
     out_filename = NULL;
 }

 void test02(){
     char filename[];

     printf("请输入视频路径：\n");
     scanf("%s", filename);

     char tmp[] = {  };
     int pos = ;
     for (int i = ; i < strlen(filename) - ; ++i){
         tmp[pos++] = filename[i];
     }
     tmp[pos] = '\0'; //不写\0会出现烫烫烫乱码
     strcat(tmp, "_out.avi");

     printf("%s\n", tmp);
 }

 int main(){

     test01();
     test02();

     system("pause");
     return ;
 }

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