View Compilation Error

0_0_15463724_10187.cpp: In function 'int main()':
0_0_15463724_10187.cpp:4:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);
                  ^
0_0_15463724_10187.cpp:9:28: error: 'pow' was not declared in this scope
        int result=pow( 2,m )-1;   
                            ^
0_0_15463724_10187.cpp:10:27: error: 'printf' was not declared in this scope
       printf("%d\n",result);
                           ^