Thread: Function prototypes

  1. #1
    Registered User
    Join Date
    Oct 2009

    Post Function prototypes

    Hi, this is my first post on this site, so hopefully this is correct way of doing things.
    I have started typing a piece of code that allows input of two strings that will be placed together. However i have come across this error : "'mystrcat' : cannot convert parameter 1 from 'char [80]' to 'char'" and cant figure out how to correct it.
    Any help appreciated.

    #include "stdafx.h"
    #include "ctype.h"
    #include "string.h"
    char mystrcat(char, char);
    int main()
    	char string1[80], string2[80];
    	for (;;)
    		printf("Enter string1: ");
    		scanf("%s", &string1);
    		if (!strcmp(string1, "done"))
    		printf("Enter string2: ");
    		scanf("%s", &string2);
    		printf("String1: %s String2: %s\n", string1, string2);
    		printf("Returned string : %s\n", mystrcat(string1, string2));
    		printf("String1: %s String2: %s\n", string1, string2);
    char *mystrcat(char *s, char *p)
    	size_t i,j;
        for (i = 0; s[i] != '\0'; i++);
        for (j = 0; p[j] != '\0'; j++)
            s[i+j] = p[j];
        s[i+j] = '\0';
        return s;

  2. #2
    Jack of many languages Dino's Avatar
    Join Date
    Nov 2007
    Katy, Texas
    In your function prototype, you say you will be passing a char and a char. But, you really want to pass a char pointer and a char pointer.
    Mac and Windows cross platform programmer. Ruby lover.

    Quote of the Day
    12/20: Mario F.:I never was, am not, and never will be, one to shut up in the face of something I think is fundamentally wrong.

    Amen brother!

  3. #3
    Registered User
    Join Date
    Apr 2006
    Try this:

    char mystrcat(char *, char *);

  4. #4
    Registered User
    Join Date
    Oct 2009
    thank you!
    looking at it now, i can see it plain and simple.
    i guess it was the age old, you read your work, but see what you think is there

  5. #5
    Join Date
    Oct 2007
    Inside my computer
    Btw, parameter 2 should really be const.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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