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}
/* function to add two integers */ int
sum(int a, int b)

{
printf ("value of a in sum() = %d\n", a); printf
("value of b in sum() = %d\n", b);

return a + b;

}
When the above code is compiled and executed, it produces the following result:

value of a in main() = 10
value of a in sum() = 10

value of b in sum() = 20
value of c in main() = 30

Initializing Local and Global Variables
When a local variable is defined, it is not initialized by the system, you must initialize it
yourself. Global variables are initialized automatically by the system when you define them, as
follows:

Data Type Initial Default Value

int 0

char '\0'

float 0

double 0

pointer NULL

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