Question

R3.3 Find the errors in each of the following if statements. a. if x 〉 e then System.out.print(x); b, if (1 + x > Math . pow(x, Math.sqrt(2)) { y = y + x; c.if(x=1) { y++; } d. x = in·nextInt(); if (in.hasNextInt()) sum = sum + x; else System.out.println("Bad input for x"); e. String letterGrade = "F"; if (grade 〉= 90) { letterGrade _ "A"; } if (grade 〉= 80) { letterGrade- "B"; } if (grade 〉= 70) { letterGrade- "C"; } if (grade 〉= 60) { letterGrade- "D"; }

Answer 1

a)
there should be parenthesis for if Statement
if(x>0) is correct
b)
there should be closing parenthesis for if Statement.
if(1+x>Math.pow(x,Math.sqrt(2))) {y=y+x;} is correct

c)
x=1 is assignment, if Statement accepts only boolean.
if(x==1){y++;} is correct

d)
if Statement is checking next integer input which insted should check on x.
correct statement:
if(x){
sum =sum+x;
}
else{
System.out.println("Bad input for x");
}

e)

All for if statmets will be executed each time. suppose grade is 90
90>=90 satisfies.
90 >= 80 also satisfies
90 >= 70 also satisfies
90 >= 60 also satisfies
which produces the letterGrade as D which instead should be A. so to correct this use else if for the last three.