Beginner Help Please?

[Zexious]

I need help on how to combine input. For example, I declare the variables a and b

int a,b;

Next I plan on taking the input. If I use:

scanf("%d%d", &a, &b);

it will take input "a" on one line, and then input "b" on another. I want them to appear as a whole

Instead of it taking input as:

22
11

I want it taking it in as

2211

I need to do display it this way according to the instructions of my program. How can do I this?

Sorry, if the answer is really easy, I'm a beginner.

[GReaper]

Are your numbers strictly 2 digits each?

[Zexious]

Yes, it is supposed to be input for a 24 hour clock

[GReaper]

You can use "%2d%2d".

Scanf - C++ Reference

[whiteflags]

Yes, it is supposed to be input for a 24 hour clock

Oh? Why not then

if ( scanf( "%d:%d", &hrs, &mins) == 2 ) {
   /* make sure it's a real time value here */
}

In general, any character stands for itself in a format string, unless it's preceded by a % which implies a conversion of some sort.

If you really insist on something like 2211 being valid, string manipulation, in addition to something like strtol, is probably best.

[Zexious]

OHHH I knew it was something simple. Thanks guys!!

[memcpy]

@Whiteflags

This is incredibly picky, but sometimes it's better to do something like this:

if ( scanf( "%d:%d", &hrs, &mins) != 2 ) {   
   /* error handling */ 
}
if ( hrs > 24 || mins > 60) {
   /* error handling */ 
}

/* your code */

So your code doesn't end up looking like this:

if ( scanf( "%d:%d", &hrs, &mins) == 2 ) {    
   if ( hrs > 24 || mins > 60) {
      /* your code, let's hope it doesn't have many more indents */
   } 
}

Again, not really an issue, but throwing it out there just in case.

[Zexious]

Ok this is what I came up with so far using the knowledge I know. The program should operate like this:

Sample Input

1300

Sample Output

1300 in Ottawa
1000 in Victoria
1100 in Edmonton
1200 in Winnipeg
1300 in Toronto
1400 in Halifax
1430 in St. John’s

However my code seems to not display some numbers at the end of the output. Can anyone help please?

insert

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


int main(int argc, char *argv[])
{
  int hrs,min;
  int vic,edm,win,hal,stj;
  
 scanf("%2d%2d", &hrs, &min);
 if ( hrs <= 23 && min <= 59 ) {     
 
 vic = hrs - 3;                   
 edm = hrs - 2;
 win = hrs - 1;
 hal = hrs + 1;
 stj = hrs + 1, min + 30;
     
      printf("The time in Ottawa is %d%d\n", hrs, min);
      printf("The time in Victoria is %d%d\n", vic, min);
      printf("The time in Edmonton is %d%d\n", edm, min);
      printf("The time in Winnipeg is %d%d\n", win, min);
      printf("The time in Toronto is %d%d\n", hrs, min);
      printf("The time in Halifax is %d%d\n", hal, min);
      printf("The time in St.John's is %d%d\n", stj);
}
  
  system("PAUSE");    
  return 0;
}

The program is not complete yet, but I need to match the sample output before moving on

[GReaper]

Are you sure lines #17 and #25 do what you want?

[Zexious]

I want to increase the time entered by 1 hour and 30 min and store it in stj. I guess I'm doing it wrong since it doesn't work

[GReaper]

Doesn't your compiler give you warnings about unused result and too few arguments passed to printf?

[Zexious]

Well I guess it didn't for this case. I'm using Dev-C++

[GReaper]

You need to pass one more variable to the last printf. Declare another variable, replace the comma on line #17 with a semicolon, and assign "min + 30" to you new variable. Then add its name at the end of printf on line #25.

EDIT: You may want to check if the different hours go below zero or if the minutes go above or are equal to 60, in which cases you'll have to correct them.

[whiteflags]

Again, not really an issue, but throwing it out there just in case.

Fair enough, but my comment didn't really say anything that you implied. I said to make sure the input was a real time value after the scanf returned. If people do get the impression to go on with the rest of the program under the scanf call from my snippet, well, you steered them clear....

[Zexious]

Thanks a lot!!! but I don't understand why my output is displaying for ex:

The time in Halifax is 140

instead of

The time in Halifax is 1400

EDIT: No I'm sure I set the appropriate conditions. If your're interested, you can read the problem here:

Problem J3
http://cemc.math.uwaterloo.ca/contes...1/juniorEn.pdf