0_0_26418406_15768.cpp: In function 'int main()': 0_0_26418406_15768.cpp:7:10: error: 'o' was not declared in this scope while(n>o) ^ 0_0_26418406_15768.cpp:10:20: error: 'printf' was not declared in this scope printf("%d\n",a+b); ^