关于函数是否能改变值

int half(int y){    y++;    printf("y=%d\n", y);    return y;}int main(void){    int x = 8,c;    c=half(x);    printf("函数返回值%d\n", c);    printf("x的值%d\n", x);    return 0;}

y=9;
c=9;
x=8;