View Compilation Error

0_0_15479143_8972.cpp: In function 'int main()':
0_0_15479143_8972.cpp:9:31: error: 'YES' was not declared in this scope
      if(a%b==0) printf("%c\n",YES);
                               ^
0_0_15479143_8972.cpp:10:25: error: 'NO' was not declared in this scope
      else printf("%c\n",NO);
                         ^