0_0_13156818_27083.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
#include
^
0_0_13156818_27083.cpp:2:9: error: #include expects "FILENAME" or <FILENAME>
#include
^
0_0_13156818_27083.cpp: In function 'int main()':
0_0_13156818_27083.cpp:9:16: error: 'scanf' was not declared in this scope
scanf("%d", &n);
^
0_0_13156818_27083.cpp:18:16: error: 'pow' was not declared in this scope
/ ((pow(x3,2)-pow(x2,2))*(x2-x1)-(pow(x2,2)-pow(x1,2))*(x3-x2));
^
0_0_13156818_27083.cpp:27:22: error: 'printf' was not declared in this scope
printf("%.2lf\n", s);
^
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