Help: some errors for C programming.

pokkax · by pokkax on Thu Feb 04, 2010 9:07 am

This program would only print even lines data. (E.g line2,line4,line6...;skip line1,line3...)

compiler : visual studio c/c++

Code:: #include <stdio.h> #include <stdlib.h> #include <string.h> #define MAX 81 void writefile(void); void openfile(void); void main (void) { writefile(); openfile(); exit(0); } void writefile (void) { FILE *log = fopen("logfile.txt", "at"); char name[16],ID[11]; if (!log) log = fopen("logfile.txt", "wt"); if (!log) { printf("\nCould not write the following file, Check Disk!\n"); exit(1); }//end if printf("Please enter your name: "); gets(name); printf("Please enter your ID: "); gets(ID); fflush(stdin); if (strlen(name) >= 16 || strlen(ID) >= 11) { printf("Error!\n"); exit(1); }//end if else { fprintf(log, "%-15s %-10s\n",name,ID); }//end else fclose(log); }//end writefile void openfile (void) { FILE *fp; char name[16],ID[11],buf[MAX]; int i; fp = fopen("logfile.txt", "r"); if (fp == NULL) { printf("\nCould not find the following file, Check Disk!\n"); exit(1); }//end if while ( fgets(buf, MAX, fp) != NULL ) { fgets(buf,MAX,fp); strncpy(name,buf,15); name[15]=0; sscanf(buf+16, "%s",&ID); strupr(name); strupr(ID); printf("\nName: %s ID: %s\n",name,ID); }//end while fclose(fp); }//end openfile

**DragonMaster Jay** · by **DragonMaster Jay** on Fri Feb 05, 2010 8:16 pm

Search online for the diagnostic tool for the version of Visual Studio you run.

You might find this to be successful, otherwise try the debugger.

devesh2010 · by devesh2010 on Sun Feb 14, 2010 10:09 am

at is not a file open format use a+ or r+
instead

DoctorAcid · by DoctorAcid on Sun Feb 14, 2010 2:24 pm

What Program do you use

Try Notepad ++

~Acid

GeorgeDorn · by GeorgeDorn on Fri Feb 26, 2010 11:00 pm

This is because you read a line with fgets and then throw that line away in the subsequent call to fgets. Remove the fgets inside your while loop and it will probably work.

Code:: [...] while ( fgets(buf, MAX, fp) != NULL ) { // fgets(buf,MAX,fp); <--- REMOVE ME strncpy(name,buf,15); name[15]=0; sscanf(buf+16, "%s",&ID); strupr(name); strupr(ID); printf("\nName: %s ID: %s\n",name,ID); }//end while [...]

Programmer · by Programmer on Thu Mar 11, 2010 8:12 pm

Also when declaring a method, if you say it is a void,

Code:: void WriteFile(void)

You do not need to put void in the parameters as it is already going to return nothing and its not going to take any parameters either so don't put anything.

Code:: void WriteFile()

Hope this helped.

Help: some errors for C programming.

Help: some errors for C programming.

Re: Help: some errors for C programming.

Re: Help: some errors for C programming.

Re: Help: some errors for C programming.

Re: Help: some errors for C programming.

Re: Help: some errors for C programming.