字符串格式的Scanf

Question

I made a code that supposed to take stdin and make sure it is true depending on my scanf format.

Here is the code

#include <stdio.h>

int main()
{
    int i;
    char* a;
    i = 0;
    while (1 == scanf("/%[^/ \t\n]", a[i++]))
         printf(">%s<\n", a[i-1]);

    return 0;
}

sample input:

/test

sample output:

/test
Segmentation fault

I have no idea what is causing the segmentation fault

Answer 1

You need to provide the address of the char * , to the scanf and printf function, but you are providing an element of the same. Also, you need to allocate memory to char *a .

char *a = malloc(15*sizeof(char));
while (1 == scanf("/%[^/ \t\n]", a))
     printf(">%s<\n", a);

Output :

>test<