View Compilation Error

0_0_32502700_32548.cpp: In function 'int main()':
0_0_32502700_32548.cpp:11:24: error: 't' was not declared in this scope
     while(~scanf("%d",&t)){
                        ^
0_0_32502700_32548.cpp:14:26: error: 'swtich' was not declared in this scope
             swtich(letter){
                          ^
0_0_32502700_32548.cpp:69:13: error: 'cout' was not declared in this scope
             cout<<result<<endl;
             ^
0_0_32502700_32548.cpp:69:27: error: 'endl' was not declared in this scope
             cout<<result<<endl;
                           ^