Could someone please correct the lines in the function?Code:#include <strings.h> #include <stdio.h> char glew(char a[], char b[]); int main(void) { char a[10] = "apple & "; char b[10] = "pear"; printf("%s",glew(a,b)); return 0; } char glew(char a[], char b[]) { char c[40]; c = strcat(a,b); return c; }
I have tried hard myself. Cannot do it.
Did you get any of these errors?
Code:$ gcc -Wall -Wextra foo.c foo.c: In function ‘main’: foo.c:11:12: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=] printf("%s",glew(a,b)); ^ foo.c: In function ‘glew’: foo.c:18:9: warning: implicit declaration of function ‘strcat’ [-Wimplicit-function-declaration] c = strcat(a,b); ^ foo.c:18:9: warning: incompatible implicit declaration of built-in function ‘strcat’ foo.c:18:9: note: include ‘<string.h>’ or provide a declaration of ‘strcat’ foo.c:18:7: error: assignment to expression with array type c = strcat(a,b); ^ foo.c:19:12: warning: return makes integer from pointer without a cast [-Wint-conversion] return c; ^ foo.c:19:12: warning: function returns address of local variable [-Wreturn-local-addr]
Like this.
Or like this, where the result array is provided by the caller.Code:char* glew(char a[], char b[]) { static char c[40]; // So it's value is preserved on function return strcpy(c,a); strcat(c,b); return c; }
Code:char* glew(char a[], char b[], char c[]) { strcpy(c,a); strcat(c,b); return c; }
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.
Thank you. (re line 1I had searched the Net and had found a char* solution, but I also found that char* is not (/ no longer) allowed.
> but I also found that char* is not (/ no longer) allowed.
What are you smoking?
You need to cite the reference for that ridiculous assertion.
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.
When I search the Net for char* being disallowed in a C function definition, I cannot find such information. So I am puzzled.Originally Posted by Salem
Thank you for your clear response to my query.
