diff --git a/.scripts/func.sh b/.scripts/func.sh
new file mode 100644
index 0000000..885acb4
--- /dev/null
+++ b/.scripts/func.sh
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+c() { printf "%s\n" "$@" | bc -l; }
diff --git a/.zshrc b/.zshrc
index dbb78e8..30c3eca 100644
--- a/.zshrc
+++ b/.zshrc
@@ -30,6 +30,7 @@ source $ZSH/oh-my-zsh.sh
 source /usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
 
 source "$SCRIPTS/alias.sh"
+source "$SCRIPTS/func.sh"
 
 # start ssh-agent automatically
 ssh-agent