View Compilation Error

0_0_34043553_12293.cpp: In function 'int main()':
0_0_34043553_12293.cpp:8:6: error: 'i' was not declared in this scope
  for(i=0;i<n;i++)  while(n--)
      ^
0_0_34043553_12293.cpp:11:21: error: 'strien' was not declared in this scope
   for(j=0;j<strien(s);j++)
                     ^
0_0_34043553_12293.cpp:24:6: error: 'i' was not declared in this scope
   if(i!=n-1)printf("\n");
      ^