#include <stdio.h>
int main()
{
char name[256];
printf("What's your name?\n");
scanf("%s",name);
printf("Hello, %s%s",name,"!");
}The scanf() function in C can be used to read a whole line by using the "%[^\n]s" format specifier. This will read all characters until a newline character is encountered. For example:
char line[100];
scanf("%[^\n]s", line);
Yes, the fgets() function can also be used to read a whole line in C. It takes in the input stream, the maximum number of characters to read, and the destination buffer. For example:
char line[100];
fgets(line, 100, stdin);
To handle whitespace characters while reading a whole line in C, you can use the "%[^\n]s" or "%[^\n]c" format specifier with the scanf() function. This will read all characters until a newline character is encountered, including whitespace characters. For example:
char line[100];
scanf("%[^\n]s", line);
Yes, you can use the fgets() function to read a whole line in C without including the newline character. This function reads until it encounters a newline character or reaches the maximum number of characters specified. To remove the newline character, you can use the strtok() function to split the string at the newline character. For example:
char line[100];
fgets(line, 100, stdin);
strtok(line, "\n");
If there is an input error while reading a whole line in C, the scanf() and fgets() functions will return NULL. You can use this return value to check for errors and handle them accordingly. Additionally, you can use the feof() function to check for the end-of-file indicator. For example:
char line[100];
if (scanf("%[^\n]s", line) == NULL) {
printf("Input error!");
}