b) Global declaration: This section declares some variables that are used in more than one function.
These variables are known as global variables. This section must be declared outside of all the
functions.
c) Functionmain (): Every program written inC language must contain main () function. Empty
parenthesis after main is necessary. The function main () is a starting point of every C program.
The execution of the program always begins with the function main (}. Except the main() function,
other sections may not be necessary. The program execution starts from the opening brace ({) and
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