diff --git a/.gitignore b/.gitignore
index fc1df2b..a1c45f1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,4 +45,5 @@ nasal.exe
 
 # misc
 .vscode
-dump
\ No newline at end of file
+dump
+a.ppm
\ No newline at end of file
diff --git a/README.md b/README.md
index 9f26b2a..f91e9ed 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
 
 ![GitHub code size](https://img.shields.io/github/languages/code-size/ValKmjolnir/Nasal-Interpreter?style=flat-square&logo=github)
 ![GitHub release(latest by date)](https://img.shields.io/github/v/release/ValKmjolnir/Nasal-Interpreter?style=flat-square&logo=github)
-![in dev](https://img.shields.io/badge/dev-v10.0-blue?style=flat-square&logo=github)
+![in dev](https://img.shields.io/badge/dev-v10.1-blue?style=flat-square&logo=github)
 [![license](https://img.shields.io/badge/license-MIT-green?style=flat-square&logo=github)](./LICENSE)
 
 > This document is also available in: [__中文__](./doc/README_zh.md) | [__English__](./README.md)
diff --git a/makefile b/makefile
index 1cd36ba..688ede4 100644
--- a/makefile
+++ b/makefile
@@ -59,6 +59,7 @@ test:nasal
 	@ ./nasal -op -e test/nasal_test.nas
 	@ ./nasal -op -c test/occupation.nas
 	@ ./nasal -op -t -d test/pi.nas
+	@ ./nasal -op -c test/ppmgen.nas
 	@ ./nasal -op -t -d test/prime.nas
 	@ ./nasal -op -e test/qrcode.nas
 	@ ./nasal -op -t -d test/quick_sort.nas
diff --git a/nasal.h b/nasal.h
index 041fed3..6406b44 100644
--- a/nasal.h
+++ b/nasal.h
@@ -1,6 +1,6 @@
 #ifndef __NASAL_H__
 #define __NASAL_H__
-#define __nasver "10.0"
+#define __nasver "10.1"
 
 #ifndef _MSC_VER
 #include <unistd.h>
diff --git a/test/calc.nas b/test/calc.nas
index dd5c232..d5b9f98 100644
--- a/test/calc.nas
+++ b/test/calc.nas
@@ -60,6 +60,7 @@ var testfile=[
     "nasal_test.nas   ",
     "occupation.nas   ",
     "pi.nas           ",
+    "ppmgen.nas       ",
     "prime.nas        ",
     "qrcode.nas       ",
     "quick_sort.nas   ",
diff --git a/test/md5compare.nas b/test/md5compare.nas
index 96c5894..e852604 100644
--- a/test/md5compare.nas
+++ b/test/md5compare.nas
@@ -53,6 +53,7 @@ var filechecksum=func(){
         "./test/md5.nas",          "./test/md5compare.nas",
         "./test/module_test.nas",  "./test/nasal_test.nas",
         "./test/occupation.nas",   "./test/pi.nas",
+        "./test/ppmgen.nas",
         "./test/prime.nas",        "./test/qrcode.nas",
         "./test/quick_sort.nas",   "./test/scalar.nas",
         "./test/snake.nas",        "./test/tetris.nas",
diff --git a/test/ppmgen.nas b/test/ppmgen.nas
new file mode 100644
index 0000000..f8e4106
--- /dev/null
+++ b/test/ppmgen.nas
@@ -0,0 +1,20 @@
+var RD=func(i,j){
+    return chr(bits.u32_and(255,j*0.25+i*0.001));
+}
+var GR=func(i,j){
+    return chr(bits.u32_and(255,j*0.15));
+}
+var BL=func(i,j){
+    return chr(bits.u32_and(255,j*0.05));
+}
+var pixel_write=func(fd,i,j){
+    var color=RD(i,j)~GR(i,j)~BL(i,j);
+    io.write(fd,color);
+}
+
+var fd=io.open("a.ppm","wb");
+io.write(fd,"P6\n512 512\n255\n");
+for(var i=0;i<512;i+=1)
+    for(var j=0;j<512;j+=1)
+        pixel_write(fd,i,j);
+io.close(fd);
\ No newline at end of file