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int main( void )
Every program in C begins executing at the function main
The keyword int indicates that main “returns” an integer value
The void Means that main does not receive any information
The backslash (\) is called an escape character转义字符
return 0; /* indicate that program ended successfully */
Included at the end of every main function
The keyword return is to exit a function
When the return statement is used at the end of main, the value 0 indicates that the program has terminated successfully
