Please rewrite the code segment shown below in a "while" statement
and a "for" statement in C++:
total=0;
do{
cin>>grade;
if(grade!=-1)
total+=grade;
}while(grade!=-1);
抱歉，小弟不是資工系的，之前沒念過程式，請問這題該怎麼寫?
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