0_0_28549079_12804.cpp: In function 'int main()':
0_0_28549079_12804.cpp:7:5: error: 'pr' was not declared in this scope
pr();
^
0_0_28549079_12804.cpp: In function 'void pr()':
0_0_28549079_12804.cpp:14:17: error: 'ad' was not declared in this scope
sum=ad(a);
^
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