[SOLVED] how to add and multiply real numbers in cmake expression

Issue

I am doing below operation on floating variables in cmake .

I read an earlier stack overflow cmake posts and modified my code for executing below expression. But I am not getting expected result:

Results:

### RESULT 30
### A 20.0

Expected results:

### RESULT 30.0
### A 20.0

---

cmake

set(A 20.0)
set(B 80.0)

set(loop 1 ) #0 1 2 3 4 5)

function(ARTH_OPER expr output)
    execute_process(COMMAND awk "BEGIN {print ${expr}}" OUTPUT_VARIABLE __output)
    set(${output} ${__output} PARENT_SCOPE)
endfunction()

foreach(loop_val ${loop})

   ARTH_OPER("${A} + ${loop_val} * 10" RESULT)
   message("### RESULT ${RESULT}")
   message("### A ${A}")

endforeach(loop_val)

How can I get the expected result.

Solution

You could use awk's printf function and use the %f format string for printing floating point numbers and .1 to print with one decimal. Combined it becomes %.1f:

execute_process(COMMAND awk "BEGIN {printf(\"%.1f\", ${expr})}" OUTPUT_VARIABLE __output)

Answered By - Ted Lyngmo