In a program,I am giving input as two different time periods(HH::MM::SS) and getting the output as the total time.
Suppose if the inputs are:
1::30::40
2::40::40
then output is 4::11::20.
Now the question I want to ask is during the input if the HH is typed wrongly as
#::30::40, then how to create an error message fo this?
I suppose you use scanf?
int a, b, c;
int x = scanf("%d::%d::%d", &a, &b, &c);
scanf() returns the number of input fields successfully scanned, converted, and stored,
x will be given 3 on success.
If you want to check each value separately you can use multiple scanf()s
The problem with just using scanf() is what to do with the remainder "::30::40" which is still in the input buffer.
If you use fgets() with a reasonable buffer size (BUFSIZ is a good choice), then this little problem is nicely stepped over.
You then use sscanf() to have a go at parsing the input from the memory buffer. You even have the possibility of having several attempts, if you have any kind of "optional" interpretation of the input.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
hmmm, this works quite right.So I can put a condition to check if the return value of scanf() is <3 which will indicate if scanf() is successful.Originally Posted by kmdv
But is there any another way which checks the int individually?
Yes, using multiple scanf()s:
Code:int input; int result; result = scanf("%d", &input); // check if == 1 result = scanf("::%d", &input); // check if == 1 result = scanf("::%d", &input); // check if == 1
And make a function that compares and prints an error.
EDIT: use it with fgets as Salem said and replace 'scanf' with 'sscanf(buf, '
Last edited by kmdv; 08-01-2010 at 11:30 AM.
ok....thanks!!!I need to use scanf() only to keep it short and simple.And it works fine.Thanks again for your help
