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int main(){
int n;
int a,b,c,d,e;
for(int i=0;i<2;i++){  //外層迴圈
   cout<<"the #1:";
   cin>>a;
   cout<<"the #2:";
   cin>>b;
   cout<<"the #3:";
   cin>>c;
}
n=a+b+c;//將n丟到function A
 
  function_A(n,.....);
 
  cout<<"the #4:";
  cin>>d;
  cout<<"the #5:";
  cin>>e;
  //d和e 丟到function B
 
       for(int j=0;j<2;j++){ //內層迴圈
           function_B(d,e,....); 
       }
}
 
//如果迴圈數少 還可以手動輸入
//如果迴圈數百來次  那就要按上百次

prog.cpp: In function ‘int main()’:
prog.cpp:5: error: ‘cout’ was not declared in this scope
prog.cpp:6: error: ‘cin’ was not declared in this scope
prog.cpp:14: error: expected primary-expression before ‘...’ token
prog.cpp:14: error: ‘function_A’ was not declared in this scope
prog.cpp:16: error: ‘cout’ was not declared in this scope
prog.cpp:17: error: ‘cin’ was not declared in this scope
prog.cpp:23: error: expected primary-expression before ‘...’ token
prog.cpp:23: error: ‘function_B’ was not declared in this scope

Standard output is empty