View Compilation Error

0_0_25190108_17451.cpp: In function 'int main()':
0_0_25190108_17451.cpp:19:20: error: 'r' was not declared in this scope
   for (i = 1; i <= r; i++)
                    ^
0_0_25190108_17451.cpp:20:21: error: 'c' was not declared in this scope
    for (j = 1; j <= c; j++)
                     ^