Thread: Read from Console

  1. #1
    Registered User
    Join Date
    Oct 2010

    Read from Console

    Hello all

    I'm developing a c++ code which reads a line from the console like this:


    -I want to check the first character.
    -If it's "a" then i'll put the integer value after the equal on a variable that is an argument of the function. I want to use this variable outside the function (not a global variable)
    -If it's a "b" then it's boolean
    -If it's a "c" then its a string.

    Console example:

    Call my function (maybe something like this):
    int &i;
    bool b;
    char s[50];
    ReadConsoleLine(&a, &b, c);

    The first character is an "a", therefore i'm going to change the variable "a" to 34.

    I have this, code....
    Will this work?
    Any thoughts?

    void ReadConsoleLine(int a, bool b, char *c)
    	char str [50];
    	char tp[5];
    	char * strtoken;
    	scanf ("%s",str);
    	strtoken = strtok (str,"=");
    	while (strtoken != NULL)
    		strtoken = strtok (NULL, "="); //gets the text after the equal
            strncpy (tp,str,1); //gets the first character
            if(strcmp(tp, "a") == 0)//integer
    		a = atoi(strtoken);
            	if(strcmp(tp, "b") == 0)//BOOL
       			b = (strcmp(strtoken, "False");
            		if(strcmp(tp, "c") == 0)//String
         				strcpy(c, strtoken);

    Will this code work?
    Thanks in advance

  2. #2
    Registered User
    Join Date
    May 2010
    Have you tried the code? Does it work?


  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    > I'm developing a c++ code which reads a line from the console like this:
    So why is all the code you've written in C then?

    And no, your code will not work.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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