Thread: checking for floating point number

hello guys,
i have a very quick question, which might be very silly, well, i was wondering if there any funtion to find out wheather a eneterd value is a float, int or anything like that. i thought of writting a simple programe to check the value which basically check for an '.' char in a string and at the same time i am not checkking for char 'e' which sometimes used to denote floating num. does any one know any inbuilt function which actully does that.

the code which i wrote

Code:

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

int main()
{
    char num[20];
    int i;
    printf("Enter a floating point number\n?");
    fgets(num,sizeof(num),stdin);
    for(i=0;num[i]!='\0';i++)
    {
       if(num[i]=='.' && (num[i+1]-'0') >=0)
       {
       printf("%lf",atof(num));       
       getchar();
       return 0;
       }
    }
    printf("Its not a floating point number");
    getchar();
    return 0;
}
/*my output
Enter a floating point number
?12.125
12.125000

Enter a floating point number
?1254
Its not a floating point number
*/

thax very much

ssharish2005