View Compilation Error

0_0_31973838_7913.cpp: In function 'int main()':
0_0_31973838_7913.cpp:9:25: error: 'memset' was not declared in this scope
   memset(dp,0,sizeof(dp)); dp[0]=1;
                         ^
0_0_31973838_7913.cpp:15:22: error: 'scanf' was not declared in this scope
   while(scanf("%d",&n)!=EOF){
                      ^
0_0_31973838_7913.cpp:15:25: error: 'EOF' was not declared in this scope
   while(scanf("%d",&n)!=EOF){
                         ^
0_0_31973838_7913.cpp:16:22: error: 'printf' was not declared in this scope
    printf("%dn",dp[n]);
                      ^