View Compilation Error

0_0_31467117_10879.cpp: In function 'int main()':
0_0_31467117_10879.cpp:23:16: error: 'b' was not declared in this scope
         if(r+c>b)
                ^
0_0_31467117_10879.cpp:25:17: error: 'b' was not declared in this scope
         if(r+c==b)
                 ^