There is no alternative for the scanf() in C language but there are some functions which can replace some of its functionality. They are gets() and getch(). But please note that the scanf() can read a wide range of values of different data types.
There aren't functions to read integers and floats but you can use fgets with strtol for integers and strtof for floats: // floats: char str_f[20]; float f; fgets (str_f, 20, stdin); f = strtof(str_f, NULL); // integers: char str_i[20]; int i; fgets(str_i, 20, stdin); i = strtol(str_i, NULL, 0);
No. The scanf() function can read input from keyboard and stores them according to the given format specifier. It reads the input till encountering a whitespace, newline or EOF. On other hand gets() function is used to receive input from the keyboard till it encounters a newline or EOF.
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.
In brief, scanf and getchar are two functions available in C language. The main difference between scanf and getchar is that scanf is a formatted way of reading input from the keyboard while getchar reads a single character from the keyboard.
scanf reads from the standard input stream stdin. fscanf reads from the named input stream. sscanf reads from the character string s. Each function reads characters, interprets them according to a format, and stores the results in its arguments.
scanf is from a previous form of c and causes more work if you change a variable type later. cin doesn't require the variable type to be added to the call to avoid this issue. scanf is typically faster than cin due to syncing.
In general, printf and scanf are faster than cin and cout . This is because printf and scanf are based on the C standard library, which is generally faster than the C++ standard library, which cin and cout are part of.
The real problem with scanf has a completely different nature, even though it is also about overflow. When scanf function is used for converting decimal representations of numbers into values of arithmetic types, it provides no protection from arithmetic overflow. If overflow happens, scanf produces undefined behavior.
Explanation: The problem with the above code is scanf() reads an integer and leaves a newline character in the buffer. So fgets() only reads newline and the string “test” is ignored by the program.
In C programming, scanf() is one of the commonly used function to take input from the user. The scanf() function reads formatted input from the standard input such as keyboards.
Use the scanf() function to get a single word as input, and use fgets() for multiple words.
So in your code scanf() returns 1 to printf() and thus output of program is 1 . This is because if more than one statement are used in printf() execution orders starts from right to left. Thus scanf() is executed first followed by printf() .
The printf() and scanf() functions are used for input and output in C language. Both functions are inbuilt library functions, defined in stdio. h (header file).
cin and cout are streams and do not exist in C. You can use printf() and scanf() in C.
To answer your question, printf is faster.
std::cout handles all types for you, while printf requires specific syntax depending on an integer type (there are non-integer types, but the only non-integer type you will use in practice with printf is const char * (C string, can be obtained using to_c method of std::string )).
cin is not a statement, it's a variable that refers to the standard input stream. So the closest match in C is actually stdin .
The "c" in C++ cin refers to "character" and "in" means "input". Thus, cin means "character input". The C++ cin object belongs to the istream class. It accepts input from a standard input device, such as a keyboard, and is linked to stdin, the regular C input source.
So as long as you separate your inputs by a "space" in the same line, what you wrote should work. You can get more than one value with a single scanf statement. int x[3]; printf("Enter three integers, separated by spaces: "); scanf("%d %d %d", &x[0], &x[1], &x[2]); printf("You entered %d, %d, and %d.
There is nothing as such for python. For simple input parsing, the easiest way is usually to split the line into whitespace-delimited words using the split() method of string objects and then convert decimal strings to numeric values using int() or float().
The fscanf() function reads data from the current position of the specified stream into the locations that are given by the entries in argument-list, if any. Each entry in argument-list must be a pointer to a variable with a type that corresponds to a type specifier in format-string.