C Programming Language

993 readers

1 users here now

Welcome to the C community!

C is quirky, flawed, and an enormous success.
... When I read commentary about suggestions for where C should go, I often think back and give thanks that it wasn't developed under the advice of a worldwide crowd.
... The only way to learn a new programming language is by writing programs in it.

irc: #c

🌐 https://en.cppreference.com/w/c

founded 1 year ago

MODERATORS

[email protected]

C undefined input string length program (programming.dev)

submitted 1 year ago by [email protected] to c/[email protected]

6 comments fedilink hide all child comments

      ' char* strInput =(char*) malloc(sizeof(char));
        int ch;
        int letNum = 0;
        while((ch = getchar()) != EOF){
                letNum++;
                strInput = (char*)realloc(strInput,letNum*sizeof(char));
                *(strInput + letNum - 1) = ch;
        }
        printf("\n");
        printf("%s\n",strInput);
        free(strInput);`

This is the contents of main in a program I wrote that takes an undefined number of chars and prints the final string. I don't understand why but it only works if I press ctrl+D twice, and only once if I press enter before.

does anyone get what's going on? And how would you have written the program?

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 1 points 1 year ago

Thanks a lot for your answer. This might be because of my shallow understanding of how a buffer works, but I don't understand why EOF isn't consumed by getchar() when the other bytes are consumed. Isn't a char just a number and EOF too (-1 I think)? I probably should try and understand buffers more