#ifndef EX_LIB_H_ #define EX_LIB_H_ #if __cplusplus extern "C" { #endif struct math_struct; math_struct* create(); int get_sum(struct math_struct* ms, int a, int b); void free_math(struct math_struct* ms); #if __cplusplus } #endif #endif // !_EX_LIB_H_