[C Language] How to read a string with spaces?

When the scanf() function reads characters, it will stop reading when it recognizes a space, so how to read a string with spaces?

一、gets()（gets_s()）

Reads characters from standard input (stdin) (referred to as keyboard input) and stores them as a C string in str until a newline character or end-of-file is reached.

That is, the gets() function will read characters until it encounters a newline character \n (carriage return) or ends at the end of the file.

It should be noted that the gets() function is replaced by gets_s() in VS.

int main()
{
	char str[100] = "\0";
	gets_s(str);
	puts(str);
	return 0;
}

 Here you can leave the difference between gets_s() and fgets().

Two, fgets()

 From the above figure, we found that fgets() will retain the (\n) carriage return entered in the keyboard when inputting. So I tested it here, and the results are as follows:

 Obviously he outputs two newline characters, which is obviously different from my expectation, so I found that the puts() function will also output a (\n) newline character when outputting. If I replace puts() with printf(), then there will be only one fgets() newline character.

Use printf() instead:

3. scanf()

scanf("%[^\n]", str);

scanf can use the above situation to complete the input of strings with spaces.