two dimensional arrays-name swap

**slimbwoozha** · 04-24-2003

I'm trying to make a program takes the input to a name such as :
Doe, John...and then have it have John Doe at the output. Any help would be appreciated. I'm using turbo C as a compiler and here is what I have thus far......thanks

#include <stdio.h>
#include <string.h>
void pause(void);
int main()
{
char word[30][21];
char reverse[30][21];
int length
int w1count;
char run;
char c;

clrscr();

printf("The following program will reverse a name ");
printf("the user enters.\n\n");
printf("Do you want to run this program? Y for yes, N for no.\n\n");
scanf("%c", &run);

if(run == 'n' || run == 'N')
{
return 0;
}
else

clrscr();

printf("Please enter a name. Ex. Doe, John.\n");

for (count = 0 ; ; )
{
scanf("%s", word[count]);
length = strlen(word[count]) - 1;
c = word[count][length];
if ((c != ','))
count++;
else
break;
}

clrscr();
printf("The original name entered was: \n\n");

for (count = 0 ; ; )
{
printf("%s ", word[count]);
length = strlen(word[count]) - 1;
c = word[count][length];
if ( (c != ',')) )
count++;
else
break;
}

printf("\n\nThe modified name is: \n\n");

count = 0;

again:
length = strlen(word[count]) - 1;

c = word[count][length];
if ( (c !=',')) )

{
reverse[count][length] = word[count][length];

for (w1count = 1 ; w1count <= length ; w1count++)
{
reverse[count][w1count - 1] = word[count][length - w1count];
printf("%c", reverse[count][w1count - 1]);

}

printf("%c ", reverse[count][length]);

}

else

{

((reverse[0][0] >= 'a') && (reverse[0][0] <= 'z'))
reverse[0][0] = reverse[0][0] - 32;
printf("%c", reverse[count][w1count]);
}
}

c = word[count][length];

if (( c != '.') && (c != '?') && (c != '!'))
{

count++;

printf(" ");

goto again;
}

count++;

printf("\n\nPress any key to continue...");
for (;

if ( kbhit() )
break;
getch();
}

**ronin** · 04-24-2003

This post looks hauntingly familiar.

Dunno what you're trying to do with that code or if this code works, but give it a shot.

Code:

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

int main()
{
  char name[2][60], *delim;
  int i, j, index;
	
  j=0;
	
  printf("Enter name (last, first): ");
  fgets(name[0], 60, stdin);
	
  for(i=0; name[0][i] != '\0'; i++)
    if(name[0][i] == '\n')
      name[0][i] = '\0';
			
  if((delim = strchr(name[0], ',')) == NULL)
  {
    printf("ERROR: Deliminator [,] is missing from %s\n", name[0]);
    return -1;
  }	
	
  i=0;	
  index = delim - name[0] + 2;	
	
  while(name[0][index] != '\0')
    name[1][j++] = name[0][index++];	
	
  name[1][j++] = ' ';
		
  while(name[0][i] != ',')
    name[1][j++] = name[0][i++];
	
  name[1][j] = '\0';	
	
  printf("\nold name: %s\n", name[0]);
  printf("new name: %s\n", name[1]);
	
  return 0;
}

**slimbwoozha** · 04-30-2003

hey thanks a lot for that ! that helped me out soo much...but one last question if you will

how would i go about storing 25 names and making it able to have each name capable of 50 characers long...i get the idea, just not the know how.... strings ? or what. thanks for the help thus far

**quzah** · 04-30-2003

Originally posted by slimbwoozha
hey thanks a lot for that ! that helped me out soo much...but one last question if you will how would i go about storing 25 names and making it able to have each name capable of 50 characers long...i get the idea, just not the know how.... strings ? or what. thanks for the help thus far

Simply change the dimensions of the array you're using.

[number of names][length of name]

Quzah.

**slimbwoozha** · 04-30-2003

i tried increasing the array values...to [30] and [60],....but do you know how i would go about asking the user how many names they would like to type in at the beginning of the program...then wouldn't i have to do some other kind of loop regarding how many names the user wants to enter? thanks

**ronin** · 04-30-2003

Dynamic allocation could be used. I don't believe C allows non constants to be used in static arrays, but someone in the know should be able to give you a more definitive answer.

HTH

**slimbwoozha** · 04-30-2003

sorry ronin...i'm just not following you at all. sorry - this is just a hmwk assignment i'm working on and i can't seem to get the jist of it ..

**ronin** · 04-30-2003

Perhaps it is I that didn't understand your question.

Do you mean that you created a static array that your user doesn't change, but just fills it up to x location?

Code:

char names[50][80];
int count, maxnames;

printf("how many names to enter: ");
scanf("%d%*c", &maxnames);

for(count=0; count < maxnames; count++)
     fgets(names[count], 80, stdin);

Is that it?

**slimbwoozha** · 04-30-2003

i'm not the best programmer in the world- haha well i'm not quite sure what a static array is...but i guess to put it in "stupid" terms i'm just trying to get a program that can have 25 names...and 50 characters long...then the user would type in how many names they want to enter....then after they type in say 5 for example..then type -1 to get out of the loop...and the screen would clear.....then the screen would display all the names they way the user entered then (doe, john) and then a press any key at the bottom...once they pressed any key the next thing to pop up would show all the names in reversed order... (john doe) i guess i'm just having trouble making all this "click" together in my head as to how to make it work correctly

**ronin** · 04-30-2003

Hey!! don't doubt yourself. I don't know what I'm doing 90% of the time, so that's why I come here... to learn.

Ok, here's another part to play with.

Code:

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

#define MAXNAMES 25
#define MAXLEN 50 


int main(void)
{
   char names[MAXNAMES][MAXLEN];  /* size is known */
   int count, numNames, i;
   
   printf("A maximum of %d names can be entered\n", MAXNAMES);
   printf("How many names would you like to enter: ");
   scanf("%d%*c", &numNames);
   
   for(count = 0; count < numNames; count++)
   {
      printf("Enter name %d (-1 quits): ", count+1);      
      fgets(names[count], MAXLEN, stdin); 
      
      if(strncmp(names[count], "-1", 2) == 0)
         break; 
      
      for(i=0; names[count][i] != '\0'; i++)
      	if(names[count][i] == '\n')
      		names[count][i] = '\0';
   } 
   
   i = 0;
   
   while(i < count)
   {
      printf("names [%d] = %s\n", i, names[i]);
      i++;
   }  
   
   return 0;
}

I *think* this is similar to what you need in terms of entry.

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two dimensional arrays-name swap

thanks!

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