View Compilation Error

0_0_37202533_22331.cpp: In function 'int main()':
0_0_37202533_22331.cpp:30:22: error: 'scanf' was not declared in this scope
    while(scanf("%s",a)!=EOF){
                      ^
0_0_37202533_22331.cpp:30:25: error: 'EOF' was not declared in this scope
    while(scanf("%s",a)!=EOF){
                         ^
0_0_37202533_22331.cpp:31:5: error: 'cin' was not declared in this scope
     cin>>n>>t;i=0;sum=0;l=strlen(a);
     ^
0_0_37202533_22331.cpp:41:27: error: 'printf' was not declared in this scope
         printf("  ERROR\n");
                           ^
0_0_37202533_22331.cpp:46:23: error: 'printf' was not declared in this scope
             printf(" ");
                       ^
0_0_37202533_22331.cpp:49:29: error: 'printf' was not declared in this scope
             printf("%c",b[i]);
                             ^
0_0_37202533_22331.cpp:51:20: error: 'printf' was not declared in this scope
         printf("\n");
                    ^