View Compilation Error

0_0_35101760_17062.cpp: In function 'int main()':
0_0_35101760_17062.cpp:21:13: error: 'i' was not declared in this scope
         for(i=0;i<=sum;++i)  
             ^
0_0_35101760_17062.cpp:28:13: error: 'i' was not declared in this scope
         for(i=1;i<=n;i++)  
             ^
0_0_35101760_17062.cpp:39:17: error: 'j' was not declared in this scope
             for(j=0;j<=sum;j++)  
                 ^
0_0_35101760_17062.cpp:47:13: error: 'i' was not declared in this scope
         for(i=1,j=0;i<=sum;i++)  
             ^
0_0_35101760_17062.cpp:59:17: error: 'i' was not declared in this scope
             for(i=0;i<j;i++)  
                 ^