Thread: command line arguments options

Hi,
The problems of this code are:
Why switch(argv[1]) do not work?
Each time I write new information to the file the previous ones are deleted.

If you see any improvements that can be added to the code I would be grateful

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct staff{
char name[30];
int age;
};

int main(int argc, char *argv[])
{
struct staff record;
FILE *fp;
char pass[30];
int i;

if(!strcmp(argv[1],"-n")){
        printf("Enter apassword :");
        scanf("%s",pass);
        if(!strcmp(pass,"123"))
        {
                fp=fopen("Staff.dat","wb");
                for(i=1; i<=3; i++)
                {
                        printf("Enter name, age\n");
                        fseek(fp,record.age*sizeof(struct staff),SEEK_SET);
                        scanf("%s %d",record.name,&record.age);
                        fwrite(&record,sizeof(struct staff),1,fp);
                }
                fclose(fp);
        }
        else printf("Error password!:");

}

if(!strcmp(argv[1],"-l")){
        fp=fopen("Staff.dat","rb+");
        for(i=1; i<=3; i++)
        {
                
                fseek(fp,record.age*sizeof(struct staff),SEEK_SET);
                fread(&record,sizeof(struct staff),1,fp);
                printf("%s %d\n",record.name,record.age);
        }
        fclose(fp);
}

else
        printf("Wrong command");

return 0;
}

I am sure that I read one example in C programming book uses:
switch(grade){//grade is char
case 'A':
.......etc

Ok, what about the other problems

Originally Posted by quzah

So where in your C programming book did you learn that a single char is the same thing as a string?

I know that they are not the same but you said in your previous post that :

Switches operate on integers, not strings.

so I thought that it is just the case.
My aim is to learn from you nothing more

So I need to check at the beginning:
if(argc>2)
to make sure if there is argv[1]?

Thanks a lot SlyMaelstrom