Thread: Valadating letters

Hi guys,

Below is my validation function, what it should do is check the length of num1 which is a string( bad name i know!) and also convert num1 to be a floating point number, then it should check to see if the length is less than or equal to 6, and in the range of 0 -1000,


What i also need to do in this function is to check that no letters have been entered,

Code:

float validation1()           // validation1 function
         {

         length1 = strlen(num1);      // Finds out length of string
         convertnum1 = atof(num1);    // converts string to float



         if (length1 <= 6 && convertnum1 >= 0 && convertnum1 <= 1000) // check length & range
         {
         return convertnum1;
         }

         else
         {
         calc(); // calls calculation function
         }
         return 0;
         } // end of validation function

Does anybody know how this could be achieved?

i have heard of a function called isdigit(), would this be used?


Thanks alot guys

Boontune

Thanks for the help...

Boontune

What are the other two functions called with ctype.h?

i now there is:

isdigit() - for numbers

isalpha() - for letters

Can someone tell me what the other two are called?

for puncutation and space?