You are allocating memory that is one byte too short. Your calculations are for the length of the data between e.g. “Subject:” and “Content:” but do not take into account the need for a null terminator in the string. Then when you manually add the null terminator you are invoking undefined behaviour by writing past … Read more
http://www.kernel.org/doc/man-pages/online/pages/man3/getline.3.html getline already exists in stdio.h. That is why you are getting the error. Change the function name to something else like getline_my. Also, you are comparing a character with a string in line 16. It should beif(c == ‘\n’) NOT if(c == “\n”)
If you want to transform a number into another number (not number to string of characters), and you can do with a small range (0 to 1023 for implementations with 32-bit integers), you don’t need to add char* to the solution HalosGhost suggested to compact the code into a single line
Neither <iostream> nor <iostream.h> are standard C header files. Your code is meant to be C++, where <iostream> is a valid header. Use a C++ compiler such as clang++ or g++ (and a .cpp file extension) for C++ code. Alternatively, this program uses mostly constructs that are available in C anyway. It’s easy enough to … Read more
You can resolve this in several ways: Use g++ in stead of gcc: g++ -g -o MatSim MatSim.cpp Add -lstdc++: gcc -g -o MatSim MatSim.cpp -lstdc++ Replace <string.h> by <string> This is a linker problem, not a compiler issue. The same problem is covered in the question iostream linker error – it explains what is … Read more
Possible Duplicate:What is double star? I am fairly new to C, and have come across this statement I have a pretty good idea of what typedef does, but I have never seen char** before. I know that char* is a char array or similiar to a string. Im not sure if char** is a 2d … Read more
From the GNU C Library Manual: Function: char * fgets (char *s, int count, FILE *stream) The fgets function reads characters from the stream stream up to and including a newline character and stores them in the string s, adding a null character to mark the end of the string. You must supply count characters … Read more
First save your program as program.c. Now you need the compiler, so you need to go to App Store and install Xcode which is Apple’s compiler and development tools. How to find App Store? Do a “Spotlight Search” by typing ⌘Space and start typing App Store and hit Enter when it guesses correctly. App Store … Read more
I’m looking at functions such as connect() and bind() in C sockets and notice that they take a pointer to a sockaddr struct. I’ve been reading and to make your application AF-Independent, it is useful to use the sockaddr_storage struct pointer and cast it to a sockaddr pointer because of all the extra space it … Read more
My friend said that there are differences between “mod” and “remainder”. If so, what are those differences in C and C++? Does ‘%’ mean either “mod” or “rem” in C?