View Compilation Error

0_0_32591466_32437.cpp: In function 'int main()':
0_0_32591466_32437.cpp:12:12: error: redeclaration of 'int i'
        int i,n,m1,m2;
            ^
0_0_32591466_32437.cpp:9:13: note: 'int i' previously declared here
     for(int i=0;i<num;i++)
             ^