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File operations

Posted on 2006-11-18
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Last Modified: 2010-04-15
I have a loop that determines whether to continue or quit based on user input when the continue option is executed the program starts over but it no longer waits for the user to input a filename. I goes straight to the error message as if the file==NULL when I printed out the value for the file name it was indeed equalled to NULL this only happens the second time the loop executes can any one tell me why this is happening?
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Question by:wkellya
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6 Comments
 
LVL 2

Expert Comment

by:numansiddique
ID: 17973986
could you please post the code snippet where u r having tht problem
0
 

Author Comment

by:wkellya
ID: 17974213
heres the code:

printf("Enter the name and path of a .TXT file e.g. C:\\<filename>.txt:\n");
                  fflush(stdout);
                  fgets(fname, 128, stdin);
            
       if((s = strchr(fname,'\n')) != NULL) *s = '\0';/* remove newline char */
            
            fp=fopen(fname,"r");

            if(fp==NULL)
                  {
                  printf("Cannot open file.\n");/* Jumps right to here without waiting for input*/
                 return EXIT_FAILURE;
                        system("pause");
                  }
            else
0
 

Author Comment

by:wkellya
ID: 17974436
heres the loop condition:
      }/*end else*/
            printf("\n\n");
            printf("Enter Q to quit, C to continue >");
            scanf(" %c", &quit);

      }while ((quit != 'Q') && (quit != 'q'));  
  }while(1);/*Everything above is true*/
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LVL 2

Expert Comment

by:numansiddique
ID: 17975094
Hello wkellya
i would suggest you to do the following modifications.
declare quit as int

int quit;
int quit2;

in the else do this
else
{
 printf("Enter 1 to quit, 2 to continue>");
scanf("%d",&quit2);
quit = quit2;
}while(quit != 1);

these following modifications worked with me. i dont know the real problem why u r getting the problem.
0
 

Author Comment

by:wkellya
ID: 17975863
nope it still isn't alowing me to leave the loop what I should have said is that I have another while loop that allows the user to start over if the file stats are invalid. I wanted to wrap another do while around the whole thing

do{
 do{
 
   }while(1)/*Everything done in the if is true*/
}while((fname!="Quit")||(fname !="quit"))

but when i type quit in for a filename it gets accepted and goes to "Cannot find file" I just cant get out of the loop.
0
 
LVL 84

Accepted Solution

by:
ozo earned 300 total points
ID: 17976786
while(strcmp(fname,"Quit")||strcmp(fname,"quit"))
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