It looks like the line is outside the main() function. You can’t do that, because you can’t execute code outside functions. The only thing you can do at global scope is declaring variables. Just move it inside the main() or any other function, and the problem should go away. (PS: Take a look at this … Read more
This rule is wrong. It says to create a file named producer.o (with -o producer.o), but you want to create a file named main. Please excuse the shouting, but ALWAYS USE $@ TO REFERENCE THE TARGET: As Shahbaz rightly points out, the gmake professionals would also use $^ which expands to all the prerequisites in … Read more
strcpy adds a null terminator character ‘\0’. You forgot to allocate space for it: You need to add space for 5 characters: 4 for “.tde” suffix, and one more for the ‘\0’ terminator. Your current code allocates only 4, so the last write is done into the space immediately after the block that you have … Read more
Only pointers returned by calls to malloc(), realloc() or calloc() can be passed to free() (dynamically allocated memory on the heap). From section 7.20.3.2 The free function of C99 standard: The free function causes the space pointed to by ptr to be deallocated, that is, made available for further allocation. If ptr is a null … Read more
The above statement defines get to be a pointer to a character. It can store the address of an object of type char, not a character itself. The problem is with both scanf and strcmp call. You need to define an array of characters to store the input string.
you can put before the return from the main function. That will wait for a character input before exiting the program. Alternatively you could run your program from a command line and the output would be visible.
In your version rand() % 10000 will yield an integer between 0 and 9999. Since RAND_MAX may be as little as 32767, and since this is not exactly divisible by 10000 and not large relative to 10000, there will be significant bias in the ‘randomness’ of the result, moreover, the maximum value will be 0.9999, not 1.0, and you have … Read more
The debugger has knowledge about where the code for functions in your program begin and end, either because this information is provided in debugging data or because it uses any external symbols visible in the executable to provide rudimentary information. When the stack is in a proper state, it contains a return address to the … Read more
Well, yes? The function is declared to return char *, but you return i1 which is the input argument and has type int *. You might mean to return the newly allocated string dum, and perhaps also fill it with the data that was read using fgets() to the separate character array input. In this case, you need to copy the data over, … Read more
What I’d like to know is simple. Can I use OpenSSL to encrypt a string “hello” with a private key then send it to everyone who can decrypt it with the public key to retrieve the original string. I’ve searched all around and can’t really find anything. Mathematically I can use the private exponent and … Read more