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View Compilation Error

0_0_15886130_11917.cpp:19:17: error: expected ')' before 'a'
 int cross(round a,round b)
                 ^
0_0_15886130_11917.cpp:19:25: error: expected ')' before 'b'
 int cross(round a,round b)
                         ^
0_0_15886130_11917.cpp:19:26: error: expression list treated as compound expression in initializer [-fpermissive]
 int cross(round a,round b)
                          ^
0_0_15886130_11917.cpp:19:26: error: invalid conversion from 'double (*)(double)' to 'int' [-fpermissive]
0_0_15886130_11917.cpp:20:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_15886130_11917.cpp:29:19: error: expected ')' before 'a'
 bool check1(round a)
                   ^
0_0_15886130_11917.cpp:30:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_15886130_11917.cpp:33:19: error: expected ')' before 'a'
 bool check2(round a)
                   ^
0_0_15886130_11917.cpp:34:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_15886130_11917.cpp: In function 'int main()':
0_0_15886130_11917.cpp:47:34: error: 'check1' cannot be used as a function
         bool flag1=check1(wall[i]),flag2=check2(wall[i]);
                                  ^
0_0_15886130_11917.cpp:48:20: error: 'flag2' was not declared in this scope
         if(!flag1&&flag2)
                    ^
0_0_15886130_11917.cpp:63:55: error: 'cross' cannot be used as a function
             if(mark[i]==mark[j]&&cross(wall[i],wall[j])==2)
                                                       ^
0_0_15886130_11917.cpp:73:55: error: 'cross' cannot be used as a function
             if(mark[i]!=mark[j]&&cross(wall[i],wall[j])==1)
                                                       ^


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