遇到这种问题怎么解决啊？?
我只是写了scanf（“%ld”，&I）；和printf（"bonus=&d",bouns）;就有两个黄色的警告分别是Implicitly declaring library function 'scanf' with type 'int(const char *restrict,...)'和Implicitly declaring library function 'printf ' with type 'int(const char*,...)'
