Cannot open include file: ‘stdio.h’ – Visual Studio Community 2017 – C++ Error
I got same problem with a project porting from Visual Studio 2013 to Visual Studio 2017. Fix: change Properties → General → Windows SDK Version to 10
stdio
Redirecting stdio from a command in os.system() in Python
On a unix system, you can redirect stderr and stdout to /dev/null as part of the command itself. os.system(cmd + “> /dev/null 2>&1”)
Unable to open a file with fopen()
Instead of printf(“Error”);, you should try perror(“Error”) which may print the actual reason of failure (like Permission Problem, Invalid Argument, etc).
How can I capture STDOUT to a string?
A handy function for capturing stdout into a string… The following method is a handy general purpose tool to capture stdout and return it as a string. (I use this frequently in unit tests where I want to verify something printed to stdout.) Note especially the use of the ensure clause to restore $stdout (and … Read more
printf not printing to screen
Like @thejh said your stream seems to be buffered. Data is not yet written to the controlled sequence. Instead of fiddling with the buffer setting you could call fflush after each write to profit from the buffer and still enforce the desired behavior/display explicitly. printf( “Enter first integer\n” ); fflush( stdout ); scanf( “%d”, &i1 … Read more
C equivalent to fstream’s peek
fgetc+ungetc. Maybe something like this: int fpeek(FILE *stream) { int c; c = fgetc(stream); ungetc(c, stream); return c; }
How can you flush a write using a file descriptor?
I think what you are looking for may be int fsync(int fd); or int fdatasync(int fd); fsync will flush the file from kernel buffer to the disk. fdatasync will also do except for the meta data.
What exactly is the FILE keyword in C?
is this a keyword or special data type for C to handle files with? What you are refering to is a typedef’d structure used by the standard io library to hold the appropriate data for use of fopen, and its family of functions. Why is it defined as a pointer? With a pointer to a … Read more
What is the difference between getch() and getchar()?
getchar() is a standard function that gets a character from the stdin. getch() is non-standard. It gets a character from the keyboard (which may be different from stdin) and does not echo it.
Find all substring’s occurrences and locations
string str,sub; // str is string to search, sub is the substring to search for vector<size_t> positions; // holds all the positions that sub occurs within str size_t pos = str.find(sub, 0); while(pos != string::npos) { positions.push_back(pos); pos = str.find(sub,pos+1); } Edit I misread your post, you said substring, and I assumed you meant you … Read more