diff --git a/02-setjmp/jmp.c b/02-setjmp/jmp.c
new file mode 100644
index 0000000..6cd83b4
--- /dev/null
+++ b/02-setjmp/jmp.c
@@ -0,0 +1,26 @@
+#include <setjmp.h>
+#include <stdio.h>
+
+jmp_buf env;
+
+void second() {
+	printf("Inside second function\n");
+	longjmp(env, 1);  // 跳回setjmp的地方，并且setjmp返回1
+}
+
+void first() {
+	printf("Inside first function\n");
+	second();
+	printf("This line will not be printed\n");  // 不会执行到这里
+}
+
+int main() {
+	if (setjmp(env) == 0) {
+		// 第一次调用setjmp时返回0
+		first();
+	} else {
+		// 从longjmp返回时，setjmp将返回非零值
+		printf("Back to main\n");
+	}
+	return 0;
+}
\ No newline at end of file