help with character arrays

Unregistered · 03-28-2002

Hi I've just started to learn c programming at college and I'm having a bit of difficulty in getting my head aroung character arrays.In the program I'm writing I need to be able to display a grid of 11 *11. This is made up with city names and distances. I read these from a text file which is ok but its displaying them as a grid, which is causing me the headache. Any help would be great. Thanks
Dave

heres my code:

#include <stdio.h>
#include <string.h>
void print_header(); /* prototypes */
void display(char [1000]);

int main(void)
{

char option,rtn;

int nums[10][10];
char vals[11][11];

int i,j;

FILE *f;

char s[1000];

f=fopen("matrix.dat","r");

if (!f)

return 1;

while (fgets(s,1000,f)!=NULL)

printf("%s\t",s);

fclose(f);

printf("\nData read from file matrix.dat\n\n");

print_header();
scanf("%c%c",&option,&rtn);

while(option != 'q' && option != 'Q')
{ switch(option)
{
case 'd': /*display */
display(s);
break;
case 'j': /* journey */
printf("\nEnter the first destination ");
scanf("%d",&vals[i]);
printf("\nEnter the second destination ");
scanf("%d",&vals[j]);
printf("\nThe Total Miles:= ");
printf("%d",vals[i][j]);
scanf("%c",&rtn);
break;
case 'c': /* Cost of journey */
printf("\nThe Total cost of the journey is:£");
printf("%3.2f",vals[j][i]*0.4);
break;
default: /* invalid choice */
printf("Invalid choice: please try again");
}
print_header();
scanf("%c%c",&option,&rtn);

}
return 0;
}
void print_header()
{
printf("\n\nDisplay d");
printf("\n\nJourney j");
printf("\n\nCostofJourney c");
printf("\n\nExit q");
printf("\n\nENTER YOUR CHOICE:");
}

void display(char s[1000])
{

printf("\nThe destinations are\n\n");

printf("%s\t",s);

printf("\n");
}
#include <stdio.h>
#include <string.h>
void print_header(); /* prototypes */
void display(char [1000]);

int main(void)
{

char option,rtn;

int nums[10][10];
char vals[11][11];

int i,j;

FILE *f;

char s[1000];

f=fopen("matrix.dat","r");

if (!f)

return 1;

while (fgets(s,1000,f)!=NULL)

printf("%s\t",s);

fclose(f);

printf("\nData read from file matrix.dat\n\n");

print_header();
scanf("%c%c",&option,&rtn);

while(option != 'q' && option != 'Q')
{ switch(option)
{
case 'd': /*display */
display(s);
break;
case 'j': /* journey */
printf("\nEnter the first destination ");
scanf("%d",&vals[i]);
printf("\nEnter the second destination ");
scanf("%d",&vals[j]);
printf("\nThe Total Miles:= ");
printf("%d",vals[i][j]);
scanf("%c",&rtn);
break;
case 'c': /* Cost of journey */
printf("\nThe Total cost of the journey is:£");
printf("%3.2f",vals[j][i]*0.4);
break;
default: /* invalid choice */
printf("Invalid choice: please try again");
}
print_header();
scanf("%c%c",&option,&rtn);

}
return 0;
}
void print_header()
{
printf("\n\nDisplay d");
printf("\n\nJourney j");
printf("\n\nCostofJourney c");
printf("\n\nExit q");
printf("\n\nENTER YOUR CHOICE:");
}

void display(char s[1000])
{

printf("\nThe destinations are\n\n");

printf("%s\t",s);

printf("\n");
}

**quzah** · 03-28-2002

1) Please use code tags.
2) Please show us what the expected output is. Saying you want a grid does no good. (On that note, if you're planning on using a grid with 11 columns, they can have no more than 6 characters per column due to limitations of screen width in a console window.)

Quzah.

**dazzer** · 03-28-2002

Sorry I should have explained things a little better than I did. The program is to calculate the distances between two cities e.g Leeds to Liverpool. There are 10 cities, and would look something like this:

********Leeds London Liverpool etc

Leeds *****0 *****150******70

London ***150******0******180

Liverpool **70******180******0

All the Cities and distances are repeated so if some kind sole could explain to me how to do this that would be great.

**quzah** · 03-28-2002

You'll want to do something like:

Code:

#define TOTAL_CITIES 10
/*put the indentation */
printf("%6s", "" );
/* put the top row of names */
for( x = 0; x < TOTAL_CITIES; x++ )
    printf("%6s", citynames[x] );
/* print the city names and data */
for( x = 0; x < TOTAL_CITIES; x++ )
{
    printf("\n%6s ", citynames[x] );
    for( y = 0; y < TOTAL_CITIES; y++ )
    {
        printf("%6s ", citydata[y] );
    }
}

If you're using a multidimensional array, you should be able to modify this code to suit your needs. I'll not do all of your homework for you.

Quzah.

**dazzer** · 03-28-2002

Quzah thanks for your help

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