Question

hi I would like to ask how I would modify this code for the question: (It only accepts one input then prints it out. I want it to keep going until I hit enter (\n) twice.

#include <stdio.h>

#define MAXLENGTH 1000
int main(void) {
    char string[MAXLENGTH];

    fgets(string, MAXLENGTH, stdin );
    printf("%s\n", string);

    return  0;
}

I’m confused at the fgets(string, MAXLENGTH, stdin ); line, what does stdin mean/do?

EDIT: Chris, I’ve tried your way:

    #include <stdio.h>

#define MAXLENGTH 1000
int main(void) {
    char string[MAXLENGTH];


    do {
    if (!fgets(string, MAXLENGTH, stdin ))
        break;
    printf("%s", string);
    }
} while (string[0] != '\n');


    return  0;
}

It prints after i hit enter but i want to type the whole list first then allow it to print the list after I press enter twice.

Answer 1

Try this:

#include <stdio.h>
#include <string.h>

#define MAXLENGTH 1000
int main(void) 
{
    char string[MAXLENGTH];

    int i = 0;
    for(;;++i)
    {
        string[i] = getchar();
        if (i > 0 && string[i] == '\n' && string[i-1] == '\n') break;                
    }

    string[i] = 0;

    printf("Print it again:\n%s",string);

    return  0;
}