C language input string problem

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Hello everyone!!!

I'm trying to give a string as input using C.

When I give for example "Hello world" as input , I receive "Hello" only without "World".Why is this happening and how can I solve it???

What I have tried:

C++

int main(void)
{   
    char *A = "Player_1";
    char *B = "Player_2";
    char *word_A = malloc(sizeof(char) * 50);
    char *word_B = malloc(sizeof(char) * 50);
    word_A = get_word(A,B);
    printf("Word_A => %s\n" , word_A);
    word_B = get_word(B,A);
    printf("Word_B => %s\n" , word_B);
}



char *get_word(char *player_A , char *player_B)
{
    char *word = malloc(50);
    printf("%s give a word without %s looking at it: " , player_A , player_B);
    scanf("%s" , word);
    return word;
}

I also tried scanf("%[^\n]" , word); ,but then I can't input for second time and program terminates.What can I do???

Thanks...

Posted 8-Sep-20 10:40am

Nick_is_asking

Updated 8-Sep-20 11:01am

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CPallini · Accepted Answer · 2020-09-08T10:48:00

Solution 1

See, for instance:
c - How do you allow spaces to be entered using scanf? - Stack Overflow[^].

Posted 8-Sep-20 10:48am

CPallini

OriginalGriff · Accepted Answer · 2020-09-08T11:02:00

Once I'd tidied up a little, and fixed the (modern compiler enforced) errors, it works fine:

C++

#include <iostream>
char *get_word(const char *player_A , const char *player_B);
int main(void)
    {   
    const char *A = "Player_1";
    const char *B = "Player_2";
    char *word_A;
    char *word_B;
    word_A = get_word(A,B);
    printf("Word_A => %s\n" , word_A);
    word_B = get_word(B,A);
    printf("Word_B => %s\n" , word_B);
    }



char *get_word(const char *player_A , const char *player_B)
    {
    char *word = (char*) malloc(50);
    printf("%s give a word without %s looking at it: " , player_A , player_B);
    scanf("%s" , word);
    return word;
    }

The thing to note is that scanf terminates input on whitespace, not just newline: C library function - scanf() - Tutorialspoint[^] - so "hello world" will be read as two inputs: "hello" and "world".
If you want to read the whole line, you will need to use C library function - fgets() - Tutorialspoint[^] instead.