C - Segmentation Fault Somewhere -

i keep getting segmentation fault. figured out happens between these 2 lines:

            printf("%s - file exists!\n", file_name);             printf("inforloop"); 

but i'm unsure why segmentation fault keeps occuring. entire code:

#include<stdio.h> #include<unistd.h> #include<string.h>  file *fp; char err_message[128], file_name[128];  int main(int argc, char *argv[]) {     if(argc <= 2)     {         printf("error : usage %s <file name>\n", argv[0]);         return 1;     }     int = 1;     for(i; i< argc; i++)     {         strcpy(file_name, argv[i]);         if ((access(file_name, f_ok)) != -1)         {             printf("begining of loop\n");             printf("%s - file exists!\n", file_name);             printf("inforloop");             fclose(fp);         }         else        {            sprintf(err_message, "open %s", file_name);            perror(err_message);        }     }     return 0; } 

outcome:

 1  begining of loop  date.txt - file exists!  segmentation fault (core dumped) 

you're fcloseing fp, have never fopened, or initialized.

the output cut off before printing inforloop because standard output line-buffered, , there no line feed after inforloop.