# include & ltstdio.h & gt
void Fun 1。 e)
{
e = 9；
}
Invalid function 2(int *e)
{
* e = 9；
}
int main()
{
int a = 5；
fun 1(a)；
printf("%d\n "，a)；
a = 5；
fun 2(& amp； a)；
printf("%d\n "，a)；
Returns 0;
}
Although the final effect of these two functions is the same, they both change the value of a, but in the function, the meaning of parameters is different. In the first function, e is an integer variable; In the second function, e is an integer pointer variable.