How to correctly input a string in C

Question

I am currently learning C, and so I wanted to make a program that asks the user to input a string and to output the number of characters that were entered, the code compiles fin

Answer 1

This line:

char i[] = "";

is equivalent to:

char i[1] = {'\0'};

The array i has only one element, the program crashes because of buffer overflow.

I suggest you using fgets() to replace scanf() like this:

#include 
#define MAX_LEN 1024

int main(void)
{
    char line[MAX_LEN];
    if (fgets(line, sizeof(line), stdin) != NULL)
        printf("%zu\n", strlen(line) - 1);
    return 0;
}

The length is decremented by 1 because fgets() would store the new line character at the end.