Thread: conflicting types for built-in function

Im getting this error over my function prototype in the code below:

Code:

#include <stdio.h>

void strcat(char s[], char t[]); /* error here */

int main(void)
{
	char s[4] = {"abcd"};
	char t[9] = {"abcdefgh"};

	(strcat(s, t));

	return 0;

}

void strcat(char s[], char t[]){
	char match;
	int i, j, x, q;
	i = j = x = q = 0;
	while(s[i] != '\0')
		i++;
	while(s[j] != '\0')
		j++;
	while(q <= i){
	for(x = 0; x <= j; x++)
		if(s[q] == t[x]){
			match = 1;
	}
		else{
			match = 0;
	if(match == 1){
		++q;
	}
	else{
		t[j++] = s[q++];
	}

		}
	}

	int v = 0;
	while(t[v] != '\0'){
		putchar(t[v]);
				v++;
	}

}

Any ideas as to where im going wrong?

There is a standard function called strcat with the following declaration: char *strcat(char *dest, const char *src);. Try naming your function my_strcat or some such.

EDIT: Unless this is a purely academic exercise, there is no reason to reinvent the wheel.

Sweet. Thats solved that problem! Thanks!

Thanks for the heads up guys! Wasn't aware that I could leave the array size initialisation to the compiler in this context! Have altered the code as you suggested. Cheers