View Compilation Error

0_0_14876371_8342.cpp: In function 'int main()':
0_0_14876371_8342.cpp:13:5: error: 'jud' was not declared in this scope
     jud = 0;
     ^
0_0_14876371_8342.cpp:14:5: error: 'n' was not declared in this scope
     n = strlen(s);
     ^
0_0_14876371_8342.cpp:15:10: error: 'i' was not declared in this scope
     for (i = 0; i < n && s[i] == 'f'; i++);
          ^
0_0_14876371_8342.cpp:16:5: error: 'k' was not declared in this scope
     k = i;
     ^
0_0_14876371_8342.cpp:16:9: error: 'i' was not declared in this scope
     k = i;
         ^