Simple string problem

You should tokenize the string, in order to do that you can use the function strtok.

As you already have tokenized the string then you should use isalpha or isdigit to check each char inside the string...

Hope this helps!

Here is my C code,

Thanks for your support! :)

bool stringIsDigit(string s){
    int length, i;
    char letter;
    length = StringLength(s);
    for(i=0;i<length;i++){
        letter = s[i];
        if(!isdigit(letter)){
            return FALSE;
        }
    }
}

try this:

#include <stdio.h>

float f=0;
int n = sscanf("2345test", "%f", &f);

The integer returned by scanf(...) family is the number of successfully converted values. In this case it would be 1 because 2345 can be converted into a float.

If something is entered that cannot be converted into a floating point number the result will be 0.

scanf(...) is very "multi-purpose" - it is possible to scan for integers and strings, too. So you should check the documentation on it.