View Compilation Error

0_0_31943148_4124.cpp: In function 'int main()':
0_0_31943148_4124.cpp:5:18: error: 'scanf' was not declared in this scope
     scanf("%d",&c);
                  ^
0_0_31943148_4124.cpp:8:3: error: '__int64' was not declared in this scope
   __int64 a[31];
   ^
0_0_31943148_4124.cpp:9:3: error: 'a' was not declared in this scope
   a[0]=a[1]=0;a[2]=1,a[3]=2;
   ^
0_0_31943148_4124.cpp:12:11: error: expected ';' before 'sum1'
   __int64 sum1,sum2;
           ^
0_0_31943148_4124.cpp:13:3: error: 'sum1' was not declared in this scope
   sum1=sum2=1;
   ^
0_0_31943148_4124.cpp:13:8: error: 'sum2' was not declared in this scope
   sum1=sum2=1;
        ^
0_0_31943148_4124.cpp:19:34: error: 'printf' was not declared in this scope
   printf("%I64d\n",sum1/sum2*a[m]);
                                  ^