Why "when a program calls a function that can't see the prototype, the compiler thinks that the function returns an integer value"?

This is an exercise of the compiler. At the beginning, the compiler was designed to treat functions without prototypes as plastic.

When a compiler sees a function, it will first look for the prototype of the function. If there is no prototype, it will look for the definition part of the function.

In addition, in C, in C++, if the defined function does not specify the return type, it will not be compiled.

Where is Zhengzhou tattoo training school?

The Location Advantage of Qiao Sen Hospital in Haining City

Overview of 3D Laser Scanning Data Modeling

Timetable and address of Kunming Fine Arts Fair in 2023

Brief introduction of Nanjing Asiana Plastic Surgery Hospital

What food is better for the elderly without teeth? Do you have a menu?

What about Guangzhou Yidi Biotechnology Co., Ltd.?

How to get to Dayinhai Eye Hospital from Chengdu South Railway Station?

What's the surrounding environment like in No.1 Ming Di? Is life convenient?

JAVA declared an integer variable.