Table of Contents
What is sscanf in C?
In C, sscanf() is used to read formatted data. It works much like scanf() but the data will be read from a string instead of the console.
What does fopen () return?
The fopen() function returns a pointer to a FILE structure type that can be used to access the open file. Note: To use stream files (type = record) with record I/O functions, you must cast the FILE pointer to an RFILE pointer. A NULL pointer return value indicates an error.
What does atof return in C?
The atof function returns the floating-point representation of a string. The atof function skips all white-space characters at the beginning of the string, converts the subsequent characters as part of the number, and then stops when it encounters the first character that isn’t a number.
What is the output of fscanf?
fscanf reads from a file pointed by the FILE pointer (ptr), instead of reading from the input stream. Return Value: It returns zero, if unsuccessful. Otherwise, it returns The input string, if successful.
What is the use of fscanf () function?
The fscanf() function is used to read set of characters from file. It reads a word from the file and returns EOF at the end of file.
How do I use Fgets and sscanf?
If you use fgets() + sscanf() , you must enter both values on the same line, whereas fscanf() on stdin (or equivalently, scanf() ) will read them off different lines if it doesn’t find the second value on the first line you entered.
What is A+ mode in C?
a – opens a file in append mode. r+ – opens a file in both read and write mode. a+ – opens a file in both read and write mode. w+ – opens a file in both read and write mode.
What does fscanf return C?
Return Value The fscanf() function returns the number of fields that it successfully converted and assigned. The return value does not include fields that the fscanf() function read but did not assign.
What is the purpose of fscanf () and fprintf ()?
fprintf () function writes formatted data to a file. fscanf () function reads formatted data from a file.
Why Strstr function is used?
The strstr() function returns pointer to the first occurrence of the matched string in the given string. It is used to return substring from first match till the last character.
What is strcat in C?
In C/C++, strcat() is a predefined function used for string handling, under string library (string. h in C, and cstring in C++). This function appends the string pointed to by src to the end of the string pointed to by dest. It will append a copy of the source string in the destination string.
What is the difference between fgets and Fgetc?
fgets() will read the whole string upto the size specified in argument list but when end of line occurs fgetc() returns EOF while fgets() returns NULL .
Which is better fgets or scanf?
fgets is likely going to be the better choice. You can then use sscanf() to evaluate it. For numeric types, scanf() does not need to do bounds checking. For string types, you can tell scanf() to do boundary checking.