From b70f02722e9a78a07ff178dc9831a4614a83bff1 Mon Sep 17 00:00:00 2001
From: Sohyun Lee <sh119@ajou.ac.kr>
Date: Thu, 13 Jan 2022 16:26:41 +0900
Subject: [PATCH] lec07
---
lec07/fnpointer.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++
lec07/func.c | 10 ++++++++
lec07/func.h | 11 +++++++++
lec07/func.o | Bin 0 -> 1360 bytes
lec07/main.c | 9 ++++++++
lec07/main.o | Bin 0 -> 1768 bytes
6 files changed, 87 insertions(+)
create mode 100644 lec07/fnpointer.c
create mode 100644 lec07/func.c
create mode 100644 lec07/func.h
create mode 100644 lec07/func.o
create mode 100644 lec07/main.c
create mode 100644 lec07/main.o
diff --git a/lec07/fnpointer.c b/lec07/fnpointer.c
new file mode 100644
index 0000000..0bfb182
--- /dev/null
+++ b/lec07/fnpointer.c
@@ -0,0 +1,57 @@
+#include<stdio.h>
+
+void add(int *a, int *b, int *c)
+{ *c = *a + *b;}
+
+void sub(int *a, int *b, int *c)
+{ *c = *a - *b;}
+
+void div(int *a, int *b, int *c)
+{ *c = (*a) / (*b); }
+
+void mul(int *a, int *b, int *c)
+{ *c = (*a) * (*b); }
+
+int main()
+{
+ int a = 100;
+ int b = 200;
+ int c = 9999;
+ char ch;
+ int op = 0;
+
+ scanf("%d %c %d", &a, &ch, &b);
+ // ch = + :add, -:sub, *:mul, /:div
+ switch(ch)
+ {
+ case '+':
+ op = 0;
+ break;
+ case '-':
+ op = 1;
+ break;
+ case '*':
+ op = 2;
+ break;
+ case '/':
+ op = 3;
+ break;
+ }
+
+
+
+ void (*fp[4])(int *, int *, int *) = {add, sub, mul, div}; // 함수의 포인터
+ //int const *p = &a;
+ //int * const q = &a;
+ fp[op](&a, &b, &c);
+ fprintf(stdout, "%d %c %d = %d\n",a, ch, b, c);
+
+ fprintf(stdout, "a,b,c:%d %d %d\n", a, b, c);
+ fp[1](&a,&b,&c);
+ fprintf(stdout, "a,b,c:%d %d %d\n", a, b, c);
+ fp[2](&a,&b,&c);
+ fprintf(stdout, "a,b,c:%d %d %d\n", a, b, c);
+ fp[3](&a,&b,&c);
+ fprintf(stdout, "a,b,c:%d %d %d\n", a, b, c);
+
+}
diff --git a/lec07/func.c b/lec07/func.c
new file mode 100644
index 0000000..4ca0d61
--- /dev/null
+++ b/lec07/func.c
@@ -0,0 +1,10 @@
+#include "func.h"
+
+int func1(int a)
+{
+ return (a*10);
+}
+int func2(int a)
+{
+ return DF(a+1) *20;
+}
diff --git a/lec07/func.h b/lec07/func.h
new file mode 100644
index 0000000..04ac8f7
--- /dev/null
+++ b/lec07/func.h
@@ -0,0 +1,11 @@
+
+
+#if FUNCTION_NEGATIVE == 1
+#define DF(a) (-(a)*(a))
+#else
+#define DF(a) ((a)*(a))
+#endif
+
+extern int func1(int x);
+extern int func2(int x);
+
diff --git a/lec07/func.o b/lec07/func.o
new file mode 100644
index 0000000000000000000000000000000000000000..904028507d9d5c752f1f3f2d4eb7dae21721accf
GIT binary patch
literal 1360
zcmb<-^>JfjWMqH=Mg}_u1P><4z%YRc!FB*M9T>P7xEMk`I-hpd{^<_=(|O_G1181`
zj0a*5!vtOb^ae0?yZ&iDz{tP;0#w1l2TZYt8Qh(ntrRpulS=bSN)^oYO!W+OjZ48i
z!#YC?Jp&U>h$z@91_lNZD1)&oh=H*}fKi%<onrzc1A`0$1cRhSL4+fpKpT@YFIxZ)
zI|o$G1|-hFz@P-8Ve+vMd5{n`3<?7lhL8WT$uVOMAqEC!2Bbhj(#XufjKo7QnHg9S
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zqZtp1XJjEosDAVqD@Rs@#75Vz&cMI`iW746>p<-{K(YhGgxRkJ;viv|{V>`Tsvk)S
zn7I&4ViGWYFc~kXe&jR&l3M{H7#J8LpfrpE`4z?n(XI>(;8Y3=Z;%)Wb3hG*`3s~E
z6h|N$BrgFXaM%r&f;#jAn8U!p2@Pj-{UCAlum@@R0M!pGM?hjA3>5}3!B~(1l#jto
R6v6`P{ty&VNLoV{0suwpUpoK*
literal 0
HcmV?d00001
diff --git a/lec07/main.c b/lec07/main.c
new file mode 100644
index 0000000..d9dbaa2
--- /dev/null
+++ b/lec07/main.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#define FUNCTION_NEGATIVE 1
+#include "func.h"
+
+int main()
+{
+ printf("Func1 %d %d\n", func1(100), DF(10));
+ printf("Func2 %d %d\n", func2(100), DF(10));
+}
diff --git a/lec07/main.o b/lec07/main.o
new file mode 100644
index 0000000000000000000000000000000000000000..3fbad033db377c115f11b357b216583c9924ece3
GIT binary patch
literal 1768
zcmb<-^>JfjWMqH=Mg}_u1P><4z_5ZD!FB*M9T<2Sco;%GI-l-OVPIf*0TSFb=l}oz
zoyR<SZ9%*pAOb8-SOr*Z>|wXkyktWK)f5HQ6fOo3#|Xw@aCdgLQqTxZD$Oe?RWR2x
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wOX&JRVo<9<+Tb_=YN#1p1j2wC2jMU<FbFb$%2PNO&TxPlng|zxFwpe_0A=Et>Hq)$
literal 0
HcmV?d00001
--
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