Information can be passed into function.
#include
main ( )
{
int i;
i = 0;
printf (" The value of i before call %d \n", i);
f1 (i);
printf (" The value of i after call %d \n", i);
}
f1 (int k)
{
k = k + 10;
}
The value of i before call 0
The value of i after call 0