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  1. #include <stdio.h>
  2.  
  3. typedef struct UI4{
  4.   unsigned value: 17;
  5. } ui4;
  6.  
  7. int main(void)
  8. {
  9.   ui4 u;
  10.   long long lu, ls, lb;
  11.   unsigned int ui;
  12.   int si;
  13.  
  14.   u.value = 0xFFFF;
  15.   ui = 0xFFFF;
  16.   si = 0xFFFF;
  17.  
  18.   lb = u.value * u.value;
  19.   lu = ui * ui;
  20.   ls = si * si;
  21.  
  22.   printf("unsigned product:%lld signed product:%lld bitfield:%lld\n", 
  23. 	 lu, ls, lb);
  24.  
  25.   return 0;
  26. }
  27.  
Success #stdin #stdout 0.01s 1676KB
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stdin
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Standard input is empty
stdout
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unsigned product:4294836225 signed product:-131071 bitfield:-131071
https://ideone.com/D2hyu
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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