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Embedded and Microcontrollers
Embedded Forum variables values not showing equal
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  • embedded
Related

variables values not showing equal

Dnyaneshwar07
Dnyaneshwar07 over 2 years ago

Hello everyone,

                       i am using renesas rx231 series microcontroller and E2 studio ide for code development,

                         i have written one small code in which i have taken one signed int whoes value is -3871,and another variable which is also same signed int with value of 61665 which its 2's compliment value  -3871and another same variable i have taken signed int with hex value of -3871 which is 0xF0E1 ,with this i have written one if else statement but it is not working/not showing the same value.

signed int i = -3871;
signed int j = 0xf0e1;
signed int k = 61165;

_Bool m;

void main(void)
{

while(1)
{
R_Config_WDT_Restart();

if(j == k)
{
m = 1;
}
else if(j == i)
{
m = 1;
}
else if(k == i)
{
m = 1;
}
else
{
m = 0;
}
}

}

value of m remains 0 always.why this is happening??

please any can explain this?

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Top Replies

  • michaelkellett
    michaelkellett over 2 years ago +2
    You would do yourself a favour by using more modern C coding practice: add these includes to the start of every module: #include <stdint.h> #include <stdbool.h> declare 16 bit integers like this…
  • michaelkellett
    michaelkellett over 2 years ago in reply to phoenixcomm +2
    Arguments about C coding standards are as never-ending as those about religion. However, your suggestion re. Pascal is not rational - almost all micro-controllers are supported by a choice of C compilers…
  • javagoza
    javagoza over 2 years ago +1
    Are you sure that the data type int is 2 bytes and not 4 bytes? You are using only 2 bytes (16 bits) to represent an int value. It is more common to use 4 bytes (32 bits). I don't know the compiler you…
Parents
  • wolfgangfriedrich
    wolfgangfriedrich over 2 years ago

    All those 32 bit examples show j = k = 61665.

    Shouldn't m still be 1, as the first if statement is true?

     - W.Thinking

    edit: equal sign.

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  • Former Member
    Former Member over 2 years ago in reply to wolfgangfriedrich

    signed int i = -3871;
    signed int j = 0xf0e1; # j = 61665 != k = 61165
    signed int k = 61165;

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  • Former Member
    Former Member over 2 years ago in reply to wolfgangfriedrich

    signed int i = -3871;
    signed int j = 0xf0e1; # j = 61665 != k = 61165
    signed int k = 61165;

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  • wolfgangfriedrich
    wolfgangfriedrich over 2 years ago in reply to Former Member

    My bad. You are right. Thanks.

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  • Robert Peter Oakes
    Robert Peter Oakes over 2 years ago in reply to wolfgangfriedrich

    Slight smile

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