View Compilation Error

0_0_36481008_28815.cpp: In function 'int main()':
0_0_36481008_28815.cpp:60:10: error: 'a' was not declared in this scope
   memset(a, '*', sizeof(a));
          ^
0_0_36481008_28815.cpp:61:8: error: 'k' was not declared in this scope
   for (k = 0; k < 2; k++)
        ^
0_0_36481008_28815.cpp:63:9: error: 'i' was not declared in this scope
    for (i = 1; i <= n; i++)
         ^
0_0_36481008_28815.cpp:65:10: error: 'j' was not declared in this scope
     for (j = 1; j <= m; j++)
          ^