0_0_16588709_12217.cpp: In function 'int main()': 0_0_16588709_12217.cpp:18:21: error: 'change' was not declared in this scope a=a*10+change(c); ^ 0_0_16588709_12217.cpp:25:21: error: 'change' was not declared in this scope b=b*10+change(c); ^