System Function

This is a discussion on System Function within the C Programming forums, part of the General Programming Boards category; How can I use a variable in my system function? I want to pass the system time into a bacth ...

  1. #1
    Registered User
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    Question System Function

    How can I use a variable in my system function? I want to pass the system time into a bacth file I'm calling from the program.

    Thanks

    Sarah

  2. #2
    Code Goddess Prelude's Avatar
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    You need to take the variable and place it in a string that contains the system call you wish to use. For example, if you want to open a user defined file in a program defined directory, you would paste the user defined string onto the program defined string:
    strcat ( progDefined, userDefined );

    Or you could use sprintf to fill a buffer and then use that buffer to make the system call:
    sprintf ( buffer, "%s%s", progDefined, userDefined );
    system ( buffer );

    Take a look at the sprintf function for further details.

    -Prelude
    My best code is written with the delete key.

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