Largest floating value.c

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int n = 3,idx=0,i;
    float *input = (float*) malloc(sizeof(float) * n), max = 0;
    for(i = 0; i < n; i++){
        scanf("%f",input+i);
        float x = *(input+i) - (int)*(input+i);
        if(max < x){
            max = x;
            idx = i;
        }
    }
    printf("%f",*(input + idx));
    return 0;
}