A problem in checking a symmetric number (C)

Question

I have a program in C language about checking a number in an array which is symmetric or not. In some cases such as 123.321 or 100.001, do program works well. However, 10.01 is not the expected output. Please help me to find out the problem!

Also, maybe the idea in this program is not good, can you suggest other solutions? Thank you very much!

Here is my code.

#include <stdio.h>

int main(){
    int n;
    scanf("%d",&n); // numbers of elements in array
    float a[100];
    int i;
    for(i=0;i<n;i++){
        scanf("%f",&a[i]);
    }
    for(i=0;i<n;i++){
        float r;
        int c,k;
        r=a[i];

        // checking if the number is decimal or not
        if (r==(int)a[i]){
        }else{
            while (r!=(int) r){
                r=r*10;
            }            
        }
        c=(int)r;
        k=c;

        // checking if the number is symmetric or not
        int nReverse = 0, nRemain;

        while (c != 0)
        {
            nRemain = c % 10;   
            nReverse = (nReverse * 10) + nRemain;
            c = c / 10;
        }

        if(nReverse!=k){
            printf("\n%f is not symmetric ",a[i]);
        }else{
            printf("\n%f is symmetric",a[i]);
        }
    }
}