How to input an empty string in c from command prompt-CodePudding

I have been revising my skills in the way I came to C language first to start from scratch I am working out few problems myself. In the way I am writing a program which outputs the length of the entered string the code goes like this.

#include<stdio.h>
int main()
{
    char a[100];
    int n=0;
    printf("Enter the string : ");
    scanf("%s",a);
    while(a[n]!='\0')
    n  ;
    printf("length of %s is %d\n",a,n);
}

It worked. But suddenly a thought came to my mind why don't we input an empty string and check whether the output would be 0(zero). I tried pressing enter in the command prompt where I generally run my code. But it goes on asking input until and unless I entered a valid input in the sense a string with characters. But how can I enter a manual string from the command prompt does it can happen or if it will. Hope my question is answered?

CodePudding user response：

Thy the following

a[0] = '\0';
scanf( "