grade_assignment

grade

score = ("100, 90,50, 20,30, 88, 66, 75,71,91, 0, 45, 61")

score

## [1] "100, 90,50, 20,30, 88, 66, 75,71,91, 0, 45, 61"

for (i in 1:length(score)){
  print(score[i])
}

## [1] "100, 90,50, 20,30, 88, 66, 75,71,91, 0, 45, 61"

for (i in 1:length(score)){
  
  s = score[i]
  
  if(s>= 80){
    cat(i,s, "A+\n")
  }
  else if(s>= 75 || s<=79){
     cat(i,s, "A\n")
  }
  else if(s>= 70 || s<=74){
     cat(i,s, "A-\n")
  }
  else if(s>= 65 || s<=69){
     cat(i,s, "B+\n")
  }
  else if(s>= 60 || s<=64){
     cat(i,s, "B\n")
  }
  else if(s>= 55 || s<=59){
     cat(i,s, "B-\n")
  }
  else if(s>= 50 || s<=54){
     cat(i,s, "C+\n")
  }
  else if(s>= 45 || s<=49){
     cat(i,s, "C\n")
  }
  
  else if(s>= 40 || s<=44){
     cat(i,s, "D\n")
  }
  else if(s>= 0 || s<=39){
     cat(i,s, "F\n")
  }
  else{
    cat(i,s, "none")
  }
}

## 1 100, 90,50, 20,30, 88, 66, 75,71,91, 0, 45, 61 A