View Compilation Error

0_0_27980844_26548.cpp: In function 'int main()':
0_0_27980844_26548.cpp:14:7: error: 'i' was not declared in this scope
   for(i=0;i<=len1;i++)c[i][0]=0;
       ^
0_0_27980844_26548.cpp:15:7: error: 'j' was not declared in this scope
   for(j=0;j<=len2;j++)c[0][j]=0;
       ^