Here is a program to get a text file path and name from the user. These are then saved as a single string into another char variable. Then the file is opened and displayed.
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
int main()
{
char path[100],fname[100],complete[200],ch;
FILE *fp;
printf("Please enter the path to the text file (eg: c:\\users\\johnsmith\\: ");
gets(path);
printf("Enter the name of the file (eg:MyText.txt): ");
gets(fname);
sprintf(complete,"%s%s",path,fname); //this works exactly like printf, except the output is sent to the 'complete' variable.
fp=fopen(complete,"r");
if(fp==NULL)
{
printf("Cannot open file. Sorry :(");
getch();
exit(0);
}
while(ch!=EOF)
{
ch=fgetc(fp);
printf("%c",ch);
}
fclose(fp);
return 0;
}
Sprintf is important to me because I need it to run user defined commands in the DOS command line. Eg:
If I want to delete a file the user names, I prompt for the file and get its name:
printf("Enter filename: ");
gets(filename); //assume the user enters 'MyFile.exe'
sprintf(command,"delete %s",filename);
If the user entered 'MyFile.exe', the variable 'command' now contains the string 'delete MyFile.exe'. Now I can delete this file by saying:
system(command);
It comes in really handy sometimes.
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
int main()
{
char path[100],fname[100],complete[200],ch;
FILE *fp;
printf("Please enter the path to the text file (eg: c:\\users\\johnsmith\\: ");
gets(path);
printf("Enter the name of the file (eg:MyText.txt): ");
gets(fname);
sprintf(complete,"%s%s",path,fname); //this works exactly like printf, except the output is sent to the 'complete' variable.
fp=fopen(complete,"r");
if(fp==NULL)
{
printf("Cannot open file. Sorry :(");
getch();
exit(0);
}
while(ch!=EOF)
{
ch=fgetc(fp);
printf("%c",ch);
}
fclose(fp);
return 0;
}
Sprintf is important to me because I need it to run user defined commands in the DOS command line. Eg:
If I want to delete a file the user names, I prompt for the file and get its name:
printf("Enter filename: ");
gets(filename); //assume the user enters 'MyFile.exe'
sprintf(command,"delete %s",filename);
If the user entered 'MyFile.exe', the variable 'command' now contains the string 'delete MyFile.exe'. Now I can delete this file by saying:
system(command);
It comes in really handy sometimes.
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