malloc() returns a void* pointer to a block of memory stored in the heap. Allocating with malloc() does not initialize any string, only space waiting to be occupied.To add a null-terminating character, you either have to do this yourself, or use a function like scanf(), which adds this character for you. Having said this, you … Read more
In the updated code you use an uninitialized pointer: As people had wrote already, this will only work if you had pre-set all the pointers to be NULL before entering this loop:
Dealing with char, char*, and char [] in C is a little confusing in the beginning. Take a look at the following statements: The first statement and the second statement are identical in their behavior. After the first statement is executed, str1 points to a location that contains 4 characters, in consecutive order. If you … Read more
You can store the size somewhere, or you can have a struct with a special value set that you use as a sentinel, the same way that \0 indicates the end of a string.
You can return a structure from a function (or use the = operator) without any problems. It’s a well-defined part of the language. The only problem with struct b = a is that you didn’t provide a complete type. struct MyObj b = a will work just fine. You can pass structures to functions as … Read more
Drop ampersands from that line. The problem is that the & operator in this context produces an expression with a different type than what FFT expects. FFT expects a pointer to a double and &werte produces a pointer to an array of N elements. So, in order to make FFT happy, just pass werte which … Read more
You are failing to access a field of the indexed union array: mydata[0] is a value of type union data, and can’t be cast to uint64_t. You need to access the proper union member: to select the uint64_t value. No need for the cast. Also: Use PRIu64 to portably print 64-bit values, you can’t assume … Read more
num will always contain an integer because it’s an int. The real problem with your code is that you don’t check the scanf return value. scanf returns the number of successfully read items, so in this case it must return 1 for valid values. If not, an invalid integer value was entered and the num … Read more
You’re saying you have this: And you’d like to have this: You can’t have that. A char holds 1 character. That’s it. A “string” in C is an array of characters followed by a sentinel character (NULL terminator). Now if you want to copy the first x characters out of array to string you can … Read more
Got it finally: In my case, the problem resulted from a program called EGCS (Experimental/Enhanced GNU Compiler System). I installed it as a prerequisite for PSCAD(Power Systems CAD) along with a FORTRAN Compiler. Just remove it, and you’ll be fine.(Sadly, I deleted the entire PATH environmental variable due to a mistake. So what?…I ended up … Read more