Mã chấm: 268748

Main.cc: In function ‘int main()’:
Main.cc:11:21: error: expected ‘;’ before ‘pow’
  pi = pi + 4 * (-1) pow(i) / (2 * i - 1);
                     ^~~
Main.cc:10:8: warning: unused variable ‘i’ [-Wunused-variable]
  float i=0;
        ^
Main.cc:8:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~