zip command issue on linux

I have a zip command issue on Linux.

1. From command prompt:

   zip -r /../../../tst.zip /../../../tst/json
   creates tst.zip file.

   unzip tst.zip is successful.

2. With in c++ code:

   char zipcommand[sqglobal::MAX_SQ_FILE_PATH_LENGTH]={0};
   sprintf (zipcommand, "zip -r %s %s", "/../../../tst.zip", 
                                        "/../../../tst/json");
   system(zipcommand);
   

from command prompt, unzipping the zip file generated by code fails.

[root@localhost bin]# unzip SoftwareInventory.zip
Archive:  SoftwareInventory.zip
file #1:  bad zipfile offset (local header sig):  0
[root@localhost bin]#

The size of json file is 1260 Bytes. zip file size is 522 bytes.

Why unzip fails? what the error implies?