Don’t define variables in headers. Put declarations in header and definitions in one of the .c files. In config.h In some .c file: If you put a definition of a global variable in a header file, then this definition will go to every .c file that includes this header, and you will get multiple definition … Read more
You got nested loop with do/while. Make sure that each start with do end with while. Look like at the end of file, the “while” is not correct. That could be you missing the close ‘}’ before ‘while (rows <= height);’ Correct code could be:
Your use of strlen() is wrong, that is reliant on the contents of the buffer being a valid string; it doesn’t clear the entire buffer. Just use memset() with sizeof: Note that sizeof is not a function, so no parentheses are needed (or should be used, in my opinion) for cases like these. If your C library doesn’t include memset(), a plain loop … Read more
The code posted is incorrect: a_static and b_static should be defined as arrays. There are two ways to correct the code: you can add null terminators to make these arrays proper C strings: Alternately, printf can print the contents of an array that is not null terminated using the precision field: The precision given after the . specifies the maximum number of characters … Read more
malloc is used for dynamic memory allocation. As said, it is dynamic allocation which means you allocate the memory at run time. For example when you don’t know the amount of memory during compile time. One example should clear this. Say you know there will be maximum 20 students. So you can create an array with … Read more
How to read this: Invalid read of size 1 Your program is trying to read one byte from somewhere that Valgrind doesn’t like. at 0x401569: main (:395) Where in the code this happens (clearly strcmp has been inlined) Address 0x0 is not stack’d malloc’d or (recently) free’d What the address it was reading – 0x0 … Read more
You defined is_Prime inside the body of main. This is not possible in C. Or alternately, you are missing a closing curly brace at the end of main‘s body. The other problem was already mentioned in shf301’s answer.
In C language keyword const has nothing to do with constants. In C language, by definition the term “constant” refers to literal values and enum constants. This is what you have to use if you really need a constant: either use a literal value (define a macro to give your constant a name), or use a enum constant. (Read … Read more
Notice you’re not dynamically allocating the variable, which pretty much means the data inside str, in your function, will be lost by the end of the function. You should have: Then, when you call the function, the type of the variable that will receive the data must match that of the function return. So, you should … Read more
“Resource temporarily unavailable” is the error message corresponding to EAGAIN, which means that the operation would have blocked but nonblocking operation was requested. For send(), that could be due to any of: explicitly marking the file descriptor as nonblocking with fcntl(); or passing the MSG_DONTWAIT flag to send(); or setting a send timeout with the SO_SNDTIMEO socket option.