R Assignment Solution on Employee Shift Management

library(infix)
options(warn=-1)

#Exercise 1:

Enter_Hours <- as.numeric(readline(prompt="Enter Hours: "))
Enter_Rate <- as.numeric(readline(prompt="Enter Rate: "))

pay_computation_1 <- function(Enter_Hours, Enter_Rate){
  return(Enter_Hours*Enter_Rate)
}

pay_computation_1(Enter_Hours, Enter_Rate)

#Exercise 2:

pay_computation_2 <- function(){
  
  Enter_Hours <- as.numeric(readline(prompt="Enter Hours: "))
  Enter_Rate <- as.numeric(readline(prompt="Enter Rate: "))
  
  if(is.numeric(Enter_Hours)==T & is.numeric(Enter_Rate)==T){
    if(is.na(Enter_Hours*Enter_Rate) == T){
      return("Error, please enter numeric input")
    }
    return((Enter_Hours)*(Enter_Rate))
  }
}

# Now we will test this function :

pay_computation_2()
20
nine

pay_computation_2()

forty
9

#Exercise 3 :

Grade_allocation <- function(){
  score <- as.numeric(readline(prompt="Enter score: "))
  if(is.na(score*1) == T ) return("Bad score")
  
  
  if(score > 1 || score < 0>     return("Bad Score")
  }
  if(score >= 0.9) return("A")
  if(score >= 0.8) return("B")
  if(score >= 0.7) return("C")
  if(score >= 0.6) return("D")
  if(score < 0> }

#Example

Grade_allocation()
0.95

Grade_allocation()
perfect

Grade_allocation()
10

Grade_allocation()
0.75

#Exercise 4

summary_1 <- function(){
  i = 1
  number = c()
  while(1) {
    number[i] <- (readline(prompt="Enter a number: "))
    if(number[i] == "done"){
      break;
      }
    if(is.na(as.numeric(number[i])*1) == T){return("Invalid input")}
    i = i + 1
  }
  number = as.numeric(number)[-length(number)]
  return(
    cat(paste("count is:", length(number), "\n" , "total is:", sum(number), "\n", "average is:", mean(number),"\n" ,sep = " "))
    
  )
  
}

summary_1()
4
5
"bad data"

summary_1()
7
done

#Exercise 5:

summary_2 <- function(){
  i = 1
  number = c()
  while(1) {
    number[i] <- (readline(prompt="Enter a number: "))
    if(number[i] == "done"){
      break;
    }
    if(is.na(as.numeric(number[i])*1) == T){return("Invalid input")}
    i = i + 1
  }
  number = as.numeric(number)[1:(length(number) - 1)]
  return(
    cat(paste("Maximum is:", max(number), "\n" , "Minimum is:", min(number), "\n" ,sep = " "))
    
  )
  
}

summary_2()
1
1
1
2
3
done