How to read from input until newline is found using scanf

Question

I was asked to do a work in C when I m supposed to read from input until there s a space and then until the user presses enter  If I do this   scanf   2000s  2000s   a  b     It will follow the 1st rule but not the 2nd  If I write   I am smart  What I get is equivalent to  a    I   b    am   But It should be  a    I   b    am smart    I already tried   scanf   2000s  2000   n  n   a  b     and  scanf   2000s  2000   0  0   a  b     In the 1st one  it waits for the user to press Ctrl D  to send EOF  and that s not what I want  In the 2nd one  it won t compile  According to the compiler      warning  no closing         for          format   Any good way to solve this

User · Accepted Answer

scanf  and cousins  have one slightly strange characteristic  white space in  most placed in  the format string matches an arbitrary amount of white space in the input  As it happens  at least in the default  quot C quot  locale  a new-line is classified as white space  This means the trailing   n  is trying to match not only a new-line  but any succeeding white-space as well  It won t be considered matched until you signal the end of the input  or else enter some non-white space character  One way to deal with that is something like this  scanf  quot  2000s  2000   n  c quot   a  b  c    if  c    n          we read the whole line else        the rest of the line was more than 2000 characters long   c  contains a         character from the input  and there s potentially more after that as well   Depending on the situation  you might also want to check the return value from scanf  which tells you the number of conversions that were successful  In this case  you d be looking for 3 to indicate that all the conversions were successful

User · Answer

use getchar and a while that look  like this  while x   getchar             if x      n   x      0          do what you need when space or return is detected     else         mystring append x      Sorry if I wrote a pseudo-code but I don t work with C language from a while

User · Answer

include  lt stdio h gt   include  lt conio h gt   include  lt stdlib h gt   int main void      int i   0    char  a    char    malloc sizeof char    1024     while  1        scanf   c    amp a i        if  a i       n           break            else         i                a i      0     i   0    printf   n      while  a i       0         printf   c   a i        i          free a     getch      return 0

User · Answer

Sounds like a homework problem  scanf   is the wrong function to use for the problem  I d recommend getchar   or getch     Note  I m purposefully not solving the problem since this seems like homework  instead just pointing you in the right direction

User · Answer

include  lt stdio h gt  int main         char a 5  b 10       scanf   2000s  2000   n s  a b       printf  a  s b  s  a b       Just write s in place of  n

User · Answer

I am too late  but you can try this approach as well     include  lt stdio h gt   include  lt stdlib h gt   int main         int i 0  j 0  arr 100       char temp      while scanf   d c    amp arr i    amp temp            i            if temp    n                break                      for j 0  j lt i  j              printf   d    arr j               return 0

User · Answer

increase char array size if u want take more no  of characters   include  lt stdio h gt  int main         char s 10  s1 10       scanf  quot  n quot     imp for below statement to work     scanf  quot     n  c quot  s    to take input till the you click enter     scanf  quot  s quot  s1    to take input till a space     printf  quot  s quot  s       printf  quot  s quot  s1       return 0

User · Answer

scanf   2000s  2000   n    a  b

[c] How to read from input until newline is found using scanf()?

Examples related to c

Examples related to format

Examples related to scanf