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In one of my project I am using ARM cortex m3. Here I am trying to print a float variable value into a string variable ex. sprintf(sVar, "%f", 22.23); the value returned in sVar is never correct. But if I declare a float global variable, not even use this variable it starts printing value correctly into the sVar variable. Can anyone explain what might be going wrong here? THanks
Note that a float is 32 bit large. So when you have an immediate float value as parameter, the compiler will most probably implement identical code as if it pushed a 32-bit integer. Nothing for the linker to see, to understand that floating point support is needed.
This is similar to the old Borland Turbo C days where "everyone" wondered why printf() wasn't able to print floating point numbers.