祇獺: ax.bbs@bbs.ee.nthu.edu.tw. (athena), 獺跋: test
夹 肈: 琍琍瑈量畒 0027
祇獺: 「睲地筿诀「 (Thu Jun 8 10:52:41 1995)
锣獺: star
琍琍瑈量畒 0027 C 粂ē毙
材 5 量 ぇ 3 跑计絛瞅
Topic: Variable Scope (2)
玡量筁办跑计㎝跋办跑计ê或и瞷ㄓΤ種祘Α
/* var.c */
#include <stdio.h>
int a;
void foo (void);
void main (void)
{
a = 3;
foo ();
printf ("%d\n", a);
}
void foo (void)
{
int a;
a = 5;
printf ("%d\n", a);
}
磅︽挡狦
5
3
硂祘Α程Τ種よ foo ㄧ计いΤ㎝办跑计 a 跋
办跑计パ磅︽挡狦笵讽ㄧ计ずΤ跋办跑计籔办跑计
赣ㄧ计┮ㄏノ琌跋办跑计
钡ㄓиㄓㄧ计把计
/* swap.c */
#include <stdio.h>
void swap (int a, int b);
void main (void)
{
int a, b;
a = 3;
b = 5;
swap (a, b);
printf ("%d %d\n", a, b);
}
void swap (int a, int b)
{
int temp;
temp = a;
a = b;
b = temp;
printf ("%d %d\n", a, b);
}
磅︽挡狦
5 3
3 5
иヘ琌р main ㄧ计い a ㎝ b 传筁ㄓ琌磅︽挡狦玱⊿Τ
swap ㄧ计い传筁ㄓτ硂琌ㄧ计把计跌ㄧ计セō
跋办跑计絫珿