0_0_20247050_8187.cpp: In function 'int main()': 0_0_20247050_8187.cpp:55:8: error: 'a' was not declared in this scope if( a==0 && b==0 ){ ^ 0_0_20247050_8187.cpp:55:16: error: 'b' was not declared in this scope if( a==0 && b==0 ){ ^