Thread: Combine two strings without modifying them

  1. #1
    Registered User
    Join Date
    Apr 2009

    Combine two strings without modifying them

    I've been trying to combine two strings into a third one without modifying the original two. Heres the code I've got, but it wont compile:

    char rho_dir[50], vel_dir[50];
    char outputpath[50] = "./path/to/directory/"

    rho_dir = strcpy(rho_dir,strcat(strdup(outputpath),"fields_r ho"));
    vel_dir = strcpy(vel_dir,strcat(strdup(outputpath),"fields_v el"));

    I want to set the variables rho_dir = "./path/to/directory/fields_rho" and vel_dir = "./path/to/directory/fields_vel" without changing the string outputpath. Am I being insanely thick but I can't see an easy way to do it.

    Thanks alot,

  2. #2
    Hurry Slowly vart's Avatar
    Join Date
    Oct 2006
    Rishon LeZion, Israel
    1. use strcpy + strcat
    2. use sprintf

    sprintf(rho_di,"%s%s", outputpath,"fields_rho");
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

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