CCS/MSP430G2553: CCStudio 6.2 long int issue

th133

Part Number: MSP430G2553
Other Parts Discussed in Thread: CCSTUDIO

Tool/software: Code Composer Studio

I am using CCStudio 6.2 64 bit . The program goes like

long int d2;

int d1 = -961;

d2 = 987 * d1;

The correct result for d2 to be displayed is - 948507.( 11111111111100011000011011100101 )

But it displays -31003 ( 111111111111111111000011011100101 ).

What is the issue here, since d2 has already been declared as long..?

0 Archaeologist over 8 years ago

987 * d1 is not a 32 bit multiplication, it is a 16-bit multiplication. It is then assigned to d2, which gives an int to long conversion. You must write the constant "987" as "987l". See "How to Write Multiplies Correctly in C Code" http://www.ti.com/lit/an/spra683/spra683.pdf

0 th133 over 8 years ago in reply to Archaeologist

Sir,
Thank you for your suggestion, it works now.

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