lec08

lec08/hello.c

+#include <stdio.h>
+
+int add(int *a, int *b, int *c)
+{
+	*c =  *a + *b;
+}
+
+int main()
+{
+	int a = 100;
+	int b = 200;
+	int c = 999;
+	// int * == long long
+
+	fprintf(stdout, "%d : %lld %llx\n", a,(long long) &a,(long long) &a);
+	fprintf(stdout, "%d : %lld %llx\n", b, (long long)&b, (long long)&b);
+	add(&a, &b ,&c);
+	//c = a+b
+	fprintf(stdout, "%s %d : %d\n",__FILE__, __LINE__,c);
+	fprintf(stdout, "%s %d : %d\n",__FILE__, __LINE__,c);
+	fprintf(stdout, "%s %d : %d\n",__FILE__, __LINE__,c);
+#define ERR_DATA 2000
+#if ERR_DATA  > 1000
+#error 1024
+#else
+#warning ERR_DATA
+#endif
+	fprintf(stdout, "%s %d : %d",__FILE__, __LINE__,c);
+
+
+}

lec08/hello.s

+	.file	"hello.c"

lec08/hellocpp.c

+# 1 "hello.c"
+# 1 "<built-in>"
+# 1 "<command-line>"
+# 31 "<command-line>"
+# 1 "/usr/include/stdc-predef.h" 1 3 4
+# 32 "<command-line>" 2
+# 1 "hello.c"
+
+
+int add(int *a, int *b, int *c)
+{
+ *c = *a + *b;
+}
+
+int main()
+{
+ const int a = 100;
+ int b = 200;
+ long long c = 999;
+
+
+ fprintf(stdout, "%d : %lld %llx\n", a, &a, &a);
+ fprintf(stdout, "%d : %lld %llx\n", b, &b, &b);
+ add(&a, &b ,&c);
+
+ fprintf(stdout, "%d : %lld %llx\n", c, &c, &c);
+ fprintf(stdout, "%d : %lld %llx\n", c, &c+1, &c+1);
+ fprintf(stdout, "%d : %lld %llx\n", c, &c+2, &c+2);
+
+}

lec08/hellocpp.s

+	.file	"hellocpp.c"

lec08/macrotest.c

+#define HE HI
+#define LLO _THERE
+#define HELLO "HI THERE"
+#define CAT(a,b) a##b
+#define XCAT(a,b) CAT(a,b)
+#define CALL(fn) fn(HE,LLO)
+CAT(HE,LLO) // "HI THERE", because concatenation occurs before normal expansion
+XCAT(HE,LLO) // HI_THERE, because the tokens originating from parameters ("HE" and "LLO") are expanded first
+CALL(CAT) // "HI THERE", because parameters are expanded first
+
+#define sq(a) a*a
+sq(B)
+#define sq(a) aaa
+sq(C)