如何在C中的scanf（）函数中使用无限类型说明符？

Question

I want to use infinite type specifiers (%c) in scanf() function.

For example-

printf("Enter characters: \t");
scanf("--SPECIFIERS--");

So its not definite how much characters the user will enter. I don't want my program to ask the user the 'numbers of characters'.. but I want to allow any the numbers of characters. But its not possible to enter infinite %c in scanf(). Can anyone tell me how to do that in C?

Answer 1

I want to use infinite type specifiers (%c) in scanf() function.

You want to read an unspecified amount of data. There are a few approaches you can try:

• Use the POSIX standard getline(3) function

• Use the POSIX standard m assignment-allocation in the scanf() family of functions

   char *str; scanf("%m[^\\n]", &str); 

• Read input one char at a time and grow a buffer as you go. There are a few functions floating about on stackoverflow, doing just this

The first 2 also allocate memory which you should free(3) .

Answer 2

Use %s as qualifier for scanf . The one mentioned as below:

scanf("%s",buf);

where buf is of type:

char buf[100];