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View Compilation Error

0_0_17531777_20661.cpp: In function 'int main()':
0_0_17531777_20661.cpp:4:1: error: 'PI' was not declared in this scope
 PI=3.1415927;
 ^
0_0_17531777_20661.cpp:6:10: error: 'fabs' was not declared in this scope
 {m=fabs(n);
          ^


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