View Compilation Error

0_0_19264121_3813.cpp: In function 'int main()':
0_0_19264121_3813.cpp:4:12: error: expected unqualified-id before 'true'
  int m,n,i,true=1,sum;
            ^
0_0_19264121_3813.cpp:18:9: error: lvalue required as left operand of assignment
     true=0;
         ^
0_0_19264121_3813.cpp:31:4: error: 'sum' was not declared in this scope
    sum=a[0];
    ^