Why is the a new line in the printf output?

Question

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

int main(void){

    char noun[25];
    char plural[28];

    fgets(noun,24,stdin);
    strcpy(plural,noun);
    int len=strlen(plural);

    if(plural[len-2]=='h'||plural[len-2]=='s'){
        plural[len-1]='e';
        plural[len]='s';
        plural[len+1]='\0';
    }else if(plural[len-2]=='y'){
        plural[len-2]='i';
        plural[len-1]='e';
        plural[len]='s';
        plural[len+1]='\0';
    }else{
        plural[len-1]='s';
        plural[len]='\0';
    }

    printf("The plural of noun %s is %s\n",noun,plural);
    return 0;
}

the output is always this:

"The plural of noun horse

is horses"

even though i do not put \n the middle of the printf, only in the end.

So did you read the man-pages of the functions you use? Hint: the answer can be found easily there. — too honest for this site, Oct 21 '16 at 01:59
thanks Olaf, did a man fgets and found out when you press enter it indents a new line by it self. — Andrew, Oct 21 '16 at 02:06
but the reason i used fgets is, i need to limit the input to 25 characters. any ideas — Andrew, Oct 21 '16 at 02:07
Technically your current code limits the input to 23 characters (one of which is a `'\n'`). — melpomene, Oct 21 '16 at 02:09
Hi, take a look there: http://stackoverflow.com/questions/2693776/removing-trailing-newline-character-from-fgets-input — RobertS, Oct 21 '16 at 02:09
You can remove the newline by doing `noun[strcspn(noun, "\n")] = '\0';`. — melpomene, Oct 21 '16 at 02:10
@melpomene: That can fail if `noun` doesn't contain a newline, which can happen if `fgets` filled the array before the end of the line. — Keith Thompson, Oct 21 '16 at 02:17
@KeithThompson so can i use `scanf("%24s", noun)`, 24 to leave space of `\0` — Andrew, Oct 21 '16 at 02:22
@melpomene: You're right, I should have read the doc for `strcspn` before commenting. — Keith Thompson, Oct 21 '16 at 04:17
@Andrew: `fgets` reads a line. `scanf` with `%s` reads a sequence of non-whitespace characters. — Keith Thompson, Oct 21 '16 at 04:22

score 0 · Accepted Answer · answered Oct 21 '16 at 02:06

0

fgets is picking up a trailing newline character from stdin when you hit enter. Hence noun ends with a newline char

answered Oct 21 '16 at 02:06

Philip

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thanks you, i did what Olaf said and found that out, any help on how to limit input to 25 characters in scanf. is it this scanf("%25s",noun) – Andrew Oct 21 '16 at 02:08

Why is the a new line in the printf output?

1 Answers1