Thread: issue pointer in c

Code:

#include <stdio.h>

#define MAXLINE 1000

void str_cat(char *s, char *t);
int getchars(char *s, int max);

int main(void)
{
    char *s, *t;

    printf("input string s: \n");
    while (getchars(s, MAXLINE) == 0)
        ;
    printf("input string t: \n");
    while (getchars(t, MAXLINE) == 0)
        ;

    str_cat(s, t);
    printf("cat: %s\n", s);

    return 0;
}

void str_cat(char *s, char *t)
{
    while (*s)
        ++s;
    while (*s++ = *t++)
        ;
}

int getchars(char *s, int max)
{
    int c, i, l;

    for (i = 0, l = 0; (c = getchar()) != EOF && c != '\n'; ++i)
        if (i < max - 1) {
            *s++ = c;
            ++l;
        }
    *s = '\0';

    return l;
}

when i type "first input string s" have
the issue "test.exe has stopped working"
can some one else help me solve this problem
thanks

s have initialized
but t is same thing happen
if i initialized t also
i start run it, also have same issue come out

Code:

char *s, *t;

i change to

Code:

char s[MAXLINE];
char t[MAXLINE];

after i change i can run the program
thanks to help ^_^

Golf7 "You need both s and t pointing to buffers where your input is stored."
may i know you say that is how do to pointing to buffers ?
can you guide me
thanks

Pointers point to addresses in memory so you need an adressed block of memory to point to.