I am trying to get a user to enter a specific file name and have the program be able to read it.
FILE *fp;
char file[10];
fgets(file, sizeof(file), stdin);
fp = fopen(file, "r");
if (fp == NULL) {
printf("File doesn't open\n");
return 1;
}
This is a section of my code and what i'm currently trying to do. When i run the program and enter the file name, the output is "File doesn't open" which is my error message.
The problem is that fgets also incorporates the newline character '\n' in the string read. You need to remove it,
char* p;
if(p = *strchr( file, '\n' ))
*p = '\0';
otherwise fopen will fail.
strchr returns NULL if the character isn’t found; you should probably check for that.Assuming you meant fopen(file,...), before you can do that you must strip file of a newline. See man pages for fgets and [I suggest] strchr.
Use perror to print system error diagnostics:
int main(){
FILE *fp;
char file[10];
fgets(file, sizeof(file), stdin);
fp = fopen(file, "r");
if (!fp) {
perror(file);
return 1;
}
}
If you ask for file f, it'll print:
f
: No such file or directory
which should point you at the source of the problem (the fopen call may also fail for permissions reasons, for example).
fprintf(stderr, "File %s did not open: %s\n", file, strerror(errno));in case of error