如何在C中输入char *？

Question

Its a simple input that I want to make for char*. Why is this not working? It throws me an exception that I can't resolve..

#include "stdafx.h"
#include "stdio.h"
#include "stdlib.h"

char* GetCharSeq()
{
    char *s = (char*)malloc(100);

    scanf_s("%s", s);

    return s;
}

int main()
{
    char* charseq;

    charseq = GetCharSeq();

    return 0;
}

Answer 1

You have undefined behavior in your code. You have it because you provide to few arguments to the scanf_s function.

For every string argument, you need to provide not only the destination string but also the size of the string. So change your call to

scanf_s("%s", s, 100);

Answer 2

modify your code

char* GetCharSeq()
{
    char *s = (char*)malloc(100);

    gets(s);

    return s;
}

This will work.