Submission #16977

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
16977	2015-11-03 07:03:33	taehoon1018	초록색 삼각형 (YDX13_green)	C++98	Compilation error	0 ms	0 KiB

C

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#include <stdio.h>
double area(int x1, int y1, int x2, int y2, int x3, int y3)
{
  double res = (x1*y2 + x2*y3 + x3*y1 - x2*y1 - x3*y2 - x1*y3);
  if (res < 0)
    res = -res;
  return res;
}
int main(void)
{
  int x[2001] = { 0 };
  int y[2001] = { 0 };
  int N = 0,count = 0;
  long double sum = 0;
  srand(5);
  scanf("%d", &N);
  for (int i = 0; i < N; i++)
  {
    scanf("%d%d", &x[i], &y[i]);
  }
  if (N < 3)
  {
    printf("%.12f", 0);
    return 0;
  }
  for (int a = 0; a < N-2;a++)
  {
 
 
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Compilation message (stderr)

C.cpp: In function ‘int main()’:
C.cpp:17:9: error: ‘srand’ was not declared in this scope
  srand(5);
         ^
C.cpp:26:20: warning: format ‘%f’ expects argument of type ‘double’, but argument 2 has type ‘int’ [-Wformat=]
   printf("%.12f", 0);
                    ^
C.cpp:45:23: warning: format ‘%f’ expects argument of type ‘double’, but argument 2 has type ‘long double’ [-Wformat=]
  printf("%.12f\n", sum);
                       ^
C.cpp:19:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
                 ^
C.cpp:22:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &x[i], &y[i]);
                              ^