View Compilation Error

0_0_33241655_22223.cpp:4:7: error: 'ld' does not name a type
 const ld eps=1e-5;
       ^
0_0_33241655_22223.cpp: In function 'int main()':
0_0_33241655_22223.cpp:64:115: error: 'eps' was not declared in this scope
    while ((a[i].y-a[tu[cnt]].y)*(a[tu[cnt]].x-a[tu[cnt-1]].x)>(a[tu[cnt]].y-a[tu[cnt-1]].y)*(a[i].x-a[tu[cnt]].x)+eps)
                                                                                                                   ^
0_0_33241655_22223.cpp:79:115: error: 'eps' was not declared in this scope
    while ((a[i].y-a[tu[cnt]].y)*(a[tu[cnt]].x-a[tu[cnt-1]].x)>(a[tu[cnt]].y-a[tu[cnt-1]].y)*(a[i].x-a[tu[cnt]].x)+eps)
                                                                                                                   ^