File manipulations in C - c

Question

I am using a simple 'C' code to do the following:
1) Read from a .txt file.
2) Based on the string present in the .txt file, a directory will be created.
I am not able to perform step-2, as I am not clear with type conversions.
Here is my code:
#include <stdio.h>
#include <stdlib.h>
#include <direct.h>
int main()
{
char ch, file_name[25];
FILE *fp;
//printf("Enter the name of file you wish to see\n");
//gets(file_name);
fp = fopen("input.txt","r"); // read mode
if( fp == NULL )
{
perror("Error while opening the file.\n");
exit(EXIT_FAILURE);
}
printf("The contents of %s file are :\n", file_name);
while( ( ch = fgetc(fp) ) != EOF )
printf("%c",ch);
if( _mkdir(ch ) == 0 )
{
printf( "Directory successfully created\n" );
printf("\n");
}
fclose(fp);
return 0;
}
Here is the error:
*error #2140: Type error in argument 1 to '_mkdir'; expected 'const char *' but found 'char'.*

Answer 1

YES, compiler is right.
You are passing a char c to _mkdir, instead of a string.
You should read the string from file and store it to file_name (I guess you forget) and then
_mkdir(file_name);
See below:
#include <stdio.h>
#include <stdlib.h>
#include <direct.h>
int main()
{
char file_name[25];
FILE *fp;
fp = fopen("input.txt", "r"); // read mode
if (fp == NULL)
{
perror("Error while opening the file.\n");
exit(EXIT_FAILURE);
}
fgets(file_name, 25, fp);
_mkdir(file_name);
fclose(fp);
return 0;
}

Answer 2

It's because you only have a single char (the c in fgetc stands for char) while _mkdir wants a string (i.e. char *).
You should probably use fgets instead to read the input.

Answer 3

If you dont want to use fgets , then you can use this.
#include <stdio.h>
#include <stdlib.h>
#include <direct.h>
int main()
{
char file_name[25];
String str;
FILE *fp;
char ch;
int i=0;
fp = fopen("input.txt", "r"); // read mode
if (fp == NULL)
{
perror("Error while opening the file.\n");
exit(EXIT_FAILURE);
}
while( ( ch = fgetc(fp) ) != EOF ){
printf("%c",ch);
file_name[i];
i++
}
str=file_name;
_mkdir(str);
fclose(fp);
return 0;
}