Introduction - If you have any usage issues, please Google them yourself
The named class roll student, according to three indicators: grades weighted average (grade), the results (englishGrade) of forty-six, winning scores (hortation). Require user input the three corresponding weight values (weight1, weight2, weight3, wherein three sum equal to 1) to give the Total: score = grade* weight1+englishGrade* weight2+hortation* weight3.