根据现有数组计算一些总数

def calculate_summary(arr):
    total = 0
    max_value = float('-inf')
    min_value = float('inf')

    for num in arr:
        total += num
        if num > max_value:
            max_value = num
        if num < min_value:
            min_value = num

    average = total / len(arr)

    return total, average, max_value, min_value

# 示例用法
array = [1, 2, 3, 4, 5]
total, average, max_value, min_value = calculate_summary(array)

print("总和:", total)
print("平均值:", average)
print("最大值:", max_value)
print("最小值:", min_value)