struct array使奇怪的运行错误C.

Question

我试图运行此代码，并且在任何这些命令中都会出现运行时错误：

strcpy( memories[i].name, "file");
            memories[i].name[4]=i+48;
            memories[i].name[5]='\0';

我试图在很长一段时间内理解这个原因但却无法找到它。特别是当这个命令工作时：

strcpy( mm.name, "working file");

完整代码：

struct Memory {
   char  name[50]; //the name of the file
   char  storage[8000]; //the storage of the file
   uint32_t address;
   int   sizeInUse; //bytes that are used
   int   memory_id; 
};

//void initialMemory (struct Memory mm, struct Memory memories[]);


    struct Memory mm; //working file
    struct Memory memories[10];
    //initialMemory ( mm ,memories);
    strcpy( mm.name, "working file");
    mm.address=&mm.storage;
    mm.memory_id=-1;
    mm.sizeInUse=0;
    int i,j;
    for(i=0; i<10; i++){
        strcpy( memories[i].name, "file");
        memories[i].name[4]=i+48;
        memories[i].name[5]='\0';
        memories[i].address= &memories[i].storage;
        memories[i].memory_id=i;
        int index=(i+1)*2; //we will fill (i+1)*200 places of memory i.
        memories[i].sizeInUse= index;
        for(j=0; j<index; j++){
            memories[i].storage[j]=j+48;
        }
        memories[i].storage[index+1]='~';
    }