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0_0_31170130_20804.cpp: In function 'double cal(double, double, double, double, double, double)':
0_0_31170130_20804.cpp:28:10: error: expected initializer at end of input
   double s1
          ^
0_0_31170130_20804.cpp:28:10: error: expected '}' at end of input
0_0_31170130_20804.cpp:28:10: error: expected '}' at end of input