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  1. #include <stdio.h>
  2.  
  3. long double L = 3.14159265358979323846264338327950288419716939937510;
  4. long double M;
  5.  
  6. int main(void)
  7. {
  8.   M = L;	
  9.  
  10.   unsigned char * b = (unsigned char *)&L + sizeof(L)-1;
  11.  
  12.   for(;b>=(unsigned char *)&L;--b) 
  13.   {
  14.   	printf("%.40Lf  --  %d\n",L, (L==M));
  15.   	*b = 0;
  16.   }
  17. }
  18.  
Success #stdin #stdout 0s 9416KB
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stdin
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Standard input is empty
stdout
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3.1415926535897931159979634685441851615906  --  1
3.1415926535897931159979634685441851615906  --  1
3.1415926535897931159979634685441851615906  --  1
3.1415926535897931159979634685441851615906  --  1
3.1415926535897931159979634685441851615906  --  1
3.1415926535897931159979634685441851615906  --  1
3.1415926535897931159979634685441851615906  --  1
0.0000000000000000000000000000000000000000  --  0
0.0000000000000000000000000000000000000000  --  0
0.0000000000000000000000000000000000000000  --  0
0.0000000000000000000000000000000000000000  --  0
0.0000000000000000000000000000000000000000  --  0
0.0000000000000000000000000000000000000000  --  0
0.0000000000000000000000000000000000000000  --  0
0.0000000000000000000000000000000000000000  --  0
0.0000000000000000000000000000000000000000  --  0
https://ideone.com/Nhg97d
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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