Range validation in C

[kreuzen]

Hi everybody,

I'm trying to write a program that checks what the minimum and maximum number out of all the range numbers given.
Example: 1-10, 2-20, 3-30
min = 1
max = 30
There are also special cases where the range can be:
-20 (this is from 0 to 20)
or
20- (this is from 20 to the highest number possible, which is INT_MAX).

If I type in the "20-" range, it only seems to work for the FIRST and LAST set of range I type in.

Example: 1-10,2-20,3-30

If I change 1-10 to 1- , it will make max = INT_MAX. Also, If I change 3-30 to 3-, it will make max = INT_MAX. Although, If I try changing 2-20 to 2-, it will just change it to the highest VISIBLE number which is 30 (even though it's suppose to be INT_MAX).


Here is my code:

sscanf(resultEquals, "%d-%d", &resultMin[index], &resultMax[index]);
min = resultMin[0];
max = resultMax[0];
if(resultMax[index] == 0){
	resultMax[index] = INT_MAX;
}

if(resultMin[index] < 0){
	resultMax[index] = (resultMin[index] * -1);
	resultMin[index] = 0;
}

if(resultMin[index] < min){
	min = resultMin[index];
}

if(resultMax[index] > max){
	max = resultMax[index];
}

index++;

Any idea as to why this is happening?

Feedback is appreciated.

[gpraghuram]

I think you need to get the input as a single string and tokenize the string using -
After tokenizing you can check whether both the values valid numbers and set the values.


Raghu