View Compilation Error

0_0_26726393_24290.cpp: In function 'int main()':
0_0_26726393_24290.cpp:5:21: error: 'T' was not declared in this scope
   while(scanf("%d",&T)!=EOF)
                     ^
0_0_26726393_24290.cpp:11:5: error: 'n' was not declared in this scope
  if(n>=70&&n<80)
     ^
0_0_26726393_24290.cpp:13:5: error: 'n' was not declared in this scope
  if(n>=60&&n<70)
     ^
0_0_26726393_24290.cpp:15:5: error: 'n' was not declared in this scope
  if(n>=0&&n<60)
     ^
0_0_26726393_24290.cpp:17:5: error: 'n' was not declared in this scope
  if(n<0||n>100)
     ^