Reading float using scanf in c
Edit: I can’t reproduce the problem. Everything works as expected when I use the following code compiled with gcc: The output of gcc –version is as follows: gcc (Debian 4.7.2-5) 4.7.2
c
typedef fixed length array
The typedef would be However, this is probably a very bad idea, because the resulting type is an array type, but users of it won’t see that it’s an array type. If used as a function argument, it will be passed by reference, not by value, and the sizeof for it will then be wrong. A better … Read more
What tools are there for functional programming in C?
FFCALL lets you build closures in C — callback = alloc_callback(&function, data) returns a function pointer such that callback(arg1, …) is equivalent to calling function(data, arg1, …). You will have to handle garbage collection manually, though. Relatedly, blocks have been added to Apple’s fork of GCC; they’re not function pointers, but they let you pass around lambdas while avoiding the need to build … Read more
Difference between exec, execvp, execl, execv?
Summary: In your case I would recommend to use execvp. To find out the differences between the exec* functions you should read the documentation:https://linux.die.net/man/3/exechttps://linux.die.net/man/2/execve The difference between execl* and execv* is the argument passing. execl* require a list of arguments while execv* require a vector of arguments.A list of arguments is useful if you know … Read more
Segmentation fault- strcat
You don’t have enough space in fn. By strcat’ing on to it you overwrite the end of its stack allocation and into the stack .. hence the segmentation fault. You could try the following instead: You just have to be sure that the whole path and filename can fit into 255 characters. Alternatively you could … Read more
Using sys/socket.h functions on windows
You have two options: Use Cygwin (Unix emulation library). Port to Winsock (Windows standard library). Cygwin: lets you compile your Unix sources mostly untouched, but ties you to the Cygwin emulation library. This have two implications: general performance -no only network- will probably be less than optimal; and the target environment must have (at run … Read more
segmentation fault using scanf
You need to initialize your pointers. Alternatively, use stack-allocated arrays. For example, instead of char *name, do char name[20]. (Note that this will limit your input to 19 characters; use a larger buffer if necessary.) Right now, you are passing uninitialized pointers into scanf() which effectively means that scanf() is going to write to an … Read more
What primitive data type is time_t? [duplicate]
Unfortunately, it’s not completely portable. It’s usually integral, but it can be any “integer or real-floating type”.
Carriage return in C?
From 5.2.2/2 (character display semantics) : \b (backspace) Moves the active position to the previous position on the current line. If the active position is at the initial position of a line, the behavior of the display device is unspecified. \n (new line) Moves the active position to the initial position of the next line. … Read more
Use of flag in c?
I am the beginners of programming so,i don’t know the use flag in c.since ,i have searched many question about flag in c but i don’t get it.i request you to answer my question to you developers thank you.