foo.cc: In function 'int main()':
foo.cc:8:33: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
  scanf("%d,%d,%d,%d",&a,&b,&c,&d);
                      ~~         ^
foo.cc:8:33: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'long long int*' [-Wformat=]
foo.cc:8:33: warning: format '%d' expects argument of type 'int*', but argument 4 has type 'long long int*' [-Wformat=]
foo.cc:8:33: warning: format '%d' expects argument of type 'int*', but argument 5 has type 'long long int*' [-Wformat=]
foo.cc:9:27: error: 'pow' was not declared in this scope
  long long ans=(a*d-b*c)%(pow(10,9)+7);
                           ^~~
foo.cc:9:27: note: suggested alternative: 'putw'
  long long ans=(a*d-b*c)%(pow(10,9)+7);
                           ^~~
                           putw
foo.cc:10:17: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
  printf("%d",ans);
                 ^
foo.cc:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d,%d,%d,%d",&a,&b,&c,&d);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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