CODEWITHSUNDEEP
javaloopsfor-loop
anthony corrado
anthony corrado

Reputation: 91

For loop advances two numbers instead of one

When i put in the first input it prints the second and the third at the same time. Console:

Please enter the grade for course 1
A
Please enter the grade for course 2
Please enter the grade for course 3

Code:

import java.io.IOException;
public class MyGradeLoops {
public static void main(String[] args) throws IOException{
int grade;
for (int i=1; i<6; i++) {
    System.out.println("Please enter the grade for course " + i);
    grade = System.in.read();
    }
    System.out.println("Thank your for submitting your grades");
   }
  }

Upvotes: 1

Views: 82

Answers (1)

M A
M A

Reputation: 72854

System.in.read(); will read the next byte from the user input. When you type a number and press Enter, it would count for at least three bytes (with the two additional bytes corresponding to \r and \n new line characters).

You can simply use a Scanner instance and read the integer using Scanner#nextInt().

Scanner in = new Scanner(System.in);
for (int i = 1; i < 6; i++) {
    System.out.println("Please enter the grade for course " + i);
    grade = in.nextInt();
}

If System.in.read() is a requirement and the grade is input as a string, here's a (sort of hacky) way to do it:

for (int i = 1; i < 6; i++) {
    String grade = "";
    System.out.println("Please enter the grade for course " + i);
    char c;
    while((c = (char) System.in.read()) != '\n') {
        grade += c;
    }
    System.out.println(grade);
}

Upvotes: 6

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