diff --git a/related_info/lec7-8/Makefile b/related_info/lec7-8/Makefile
new file mode 100644
index 0000000..9aa9636
--- /dev/null
+++ b/related_info/lec7-8/Makefile
@@ -0,0 +1,19 @@
+all: lec7_1.c
+	@echo "====================================="
+	@echo "compile and analysis lec7_1"
+	@echo "====================================="
+	gcc -g -o lec7_1 lec7_1.c
+	@echo "====================================="
+	@echo "using objdump to decompile lec7_1"
+	@echo "====================================="
+	objdump -S lec7_1
+	@echo "====================================="
+	@echo "using readelf to analyze lec7_1"
+	@echo "====================================="
+	readelf -a lec7_1
+	@echo "====================================="
+	@echo "using nm to analyze lec7_1"
+	@echo "====================================="
+	nm lec7_1
+clean:
+	rm ./lec7_1
diff --git a/related_info/lec7-8/lec7_1.c b/related_info/lec7-8/lec7_1.c
new file mode 100644
index 0000000..d7d3758
--- /dev/null
+++ b/related_info/lec7-8/lec7_1.c
@@ -0,0 +1,12 @@
+void X(int b) {
+  if (b==1){
+    printf("X:: b is 1!\n");
+  }else{
+    printf("X:: b is not 1!\n");
+  }
+}
+
+int main(int argc, char * argv){
+    int a=2;
+    X(a);
+}