View Compilation Error

0_0_19214993_5039.cpp: In function 'void kmp()':
0_0_19214993_5039.cpp:38:15: error: 'printf' was not declared in this scope
   printf("0\n");
               ^
0_0_19214993_5039.cpp:42:23: error: 'printf' was not declared in this scope
   printf("%s %d\n",s,j);
                       ^
0_0_19214993_5039.cpp: In function 'int main()':
0_0_19214993_5039.cpp:47:24: error: 'scanf' was not declared in this scope
  while(scanf("%s%s",s,t)>0)
                        ^