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View Compilation Error

0_0_17307641_11422.cpp:9:13: error: 'char exp [1000]' redeclared as different kind of symbol
 char exp[MAX];
             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_17307641_11422.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:148:18: note: previous declaration 'double exp(double)'
   double __cdecl exp(double _X);
                  ^
0_0_17307641_11422.cpp: In function 'int64 dfs(int, int)':
0_0_17307641_11422.cpp:27:17: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   opr = exp[minp];
                 ^
0_0_17307641_11422.cpp:53:26: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
    ans = ans * 10 + exp[i] - '0';
                          ^
0_0_17307641_11422.cpp: In function 'int main()':
0_0_17307641_11422.cpp:62:16: error: cannot resolve overloaded function 'exp' based on conversion to type 'char*'
  while(gets(exp)){
                ^
0_0_17307641_11422.cpp:63:19: error: cannot resolve overloaded function 'exp' based on conversion to type 'const char*'
   len = strlen(exp);
                   ^
0_0_17307641_11422.cpp:66:12: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
    if(exp[i] == '*' || exp[i] == '/') priority[i] = pre + 2;
            ^
0_0_17307641_11422.cpp:66:29: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
    if(exp[i] == '*' || exp[i] == '/') priority[i] = pre + 2;
                             ^
0_0_17307641_11422.cpp:67:17: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
    else if(exp[i] == '+' || exp[i] == '-')  priority[i] = pre + 1;
                 ^
0_0_17307641_11422.cpp:67:34: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
    else if(exp[i] == '+' || exp[i] == '-')  priority[i] = pre + 1;
                                  ^
0_0_17307641_11422.cpp:68:17: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
    else if(exp[i] == '(') priority[i] = pre = pre + 4;
                 ^
0_0_17307641_11422.cpp:69:17: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
    else if(exp[i] == ')') priority[i] = pre, pre -= 4;
                 ^


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