diff --git a/README.md b/README.md
index 3f92b27..57ace20 100644
--- a/README.md
+++ b/README.md
@@ -158,6 +158,8 @@ rpn>
 |then|	true-instructions
 |else|	false-instructions
 |end|	(end of if structure)
+|ift|	similar to if-then-end, <test-instruction> <true-instruction> ift"
+|ifte|	similar to if-then-else-end, <test-instruction> <true-instruction> <false-instruction> ifte"
 |start|	repeat instructions several times
 |for|	repeat instructions several times with variable
 |next|	ex: ```1 10 start <instructions> next```
diff --git a/src/program.cpp b/src/program.cpp
index a7b3912..a13765f 100644
--- a/src/program.cpp
+++ b/src/program.cpp
@@ -108,6 +108,8 @@ program::keyword_t program::s_keywords[] =
     { cmd_branch, "for", (program_fn_t)&program::rpn_for, "repeat instructions several times with variable" },
     { cmd_branch, "next", (program_fn_t)&program::rpn_next, "ex: 1 10 start <instructions> next" },
     { cmd_branch, "step", (program_fn_t)&program::rpn_step, "ex: 1 100 start <instructions> 4 step" },
+    { cmd_keyword, "ift", &program::rpn_ift, "similar to if-then-end, <test-instruction> <true-instruction> ift" },
+    { cmd_keyword, "ifte",&program::rpn_ifte, "similar to if-then-else-end, <test-instruction> <true-instruction> <false-instruction> ifte" },
 
     //STORE
     { cmd_undef, "", NULL, "\nSTORE"},
diff --git a/src/rpn-branch.hpp b/src/rpn-branch.hpp
index 4c46b08..71c85dc 100644
--- a/src/rpn-branch.hpp
+++ b/src/rpn-branch.hpp
@@ -46,6 +46,55 @@ void rpn_end(void)
     // nothing
 }
 
+//
+void rpn_ift(void)
+{
+    MIN_ARGUMENTS(2);
+    ARG_MUST_BE_OF_TYPE(1, cmd_number);
+
+    // check ift arg
+    // arg is true if number != 0 or if is nan or +/-inf
+    number* testee = ((number*)_stack->get_obj(1));
+    
+    if (!mpfr_zero_p(testee->_value.mpfr))
+    {
+        CHECK_MPFR(stack::copy_and_push_back(*_stack, _stack->size()-1, _branch_stack));
+        (void)_stack->pop_back();
+        (void)_stack->pop_back();
+
+        CHECK_MPFR(stack::copy_and_push_back(_branch_stack, _branch_stack.size()-1, *_stack));
+        (void)_branch_stack.pop_back();
+    }
+    else
+    {
+        (void)_stack->pop_back();
+        (void)_stack->pop_back();
+    }
+}
+
+void rpn_ifte(void)
+{
+    MIN_ARGUMENTS(3);
+    ARG_MUST_BE_OF_TYPE(2, cmd_number);
+
+    // check ifte arg
+    // arg is true if number != 0 or if is nan or +/-inf
+    number* testee = ((number*)_stack->get_obj(2));
+
+    if (!mpfr_zero_p(testee->_value.mpfr))
+        CHECK_MPFR(stack::copy_and_push_back(*_stack, _stack->size()-2, _branch_stack));
+    else
+        CHECK_MPFR(stack::copy_and_push_back(*_stack, _stack->size()-1, _branch_stack));
+
+    (void)_stack->pop_back();
+    (void)_stack->pop_back();
+    (void)_stack->pop_back();
+
+    CHECK_MPFR(stack::copy_and_push_back(_branch_stack, _branch_stack.size()-1, *_stack));
+    (void)_branch_stack.pop_back();
+}
+
+//
 int rpn_start(branch& myobj)
 {
     int ret = -1;
diff --git a/test/04-branch.txt b/test/04-branch.txt
index eed00a3..1345064 100644
--- a/test/04-branch.txt
+++ b/test/04-branch.txt
@@ -80,6 +80,56 @@ erase
 -> error should be 3
 erase
 
+# ift (1)
+1 'ok' ift
+-> stack should be 'ok'
+erase
+
+# ift (2)
+0 'ok' ift
+-> stack size should be 0
+erase
+
+# ift (3)
+'ok' ift
+-> error should be 2
+-> stack size should be 1
+erase
+
+# ift (4)
+ift
+-> error should be 2
+-> stack size should be 0
+erase
+
+# ifte (1)
+1 'ok' 'nok' ifte
+-> stack should be 'ok'
+erase
+
+# ifte (2)
+0 'ok' 'nok' ifte
+-> stack should be 'nok'
+erase
+
+# ifte (3)
+'ok' 'nok' ifte
+-> error should be 2
+-> stack size should be 2
+erase
+
+# ifte (4)
+'nok' ifte
+-> error should be 2
+-> stack size should be 1
+erase
+
+# ifte (5)
+ifte
+-> error should be 2
+-> stack size should be 0
+erase
+
 # start next (1)
 1 2 start 0 next
 -> stack should be 0, 0