Find Largest Number in an Array

#include<stdio.h>
#include<malloc.h>
int main()
{
    int i, n;
    float *arr;
    arr=(float*)malloc(1*sizeof(float));
    printf("Enter the number of elements ");
    scanf("%d", &n);
    for (i = 0; i < n; ++i) {
        printf("Enter number%d: ", i + 1);
        scanf("%f", &arr[i]);
    }
    for (i = 1; i < n; ++i) {
        if (arr[0] < arr[i])
            arr[0] = arr[i];
    }
    printf("Largest element = %.2f", arr[0]);
    return 0;
}