Example problems for Loops in Java
"Problematic" examples
This page will provide different examples of loops that students might use. However, the loops by and large have a small 'issue' that is need of attention. The goal of this page is to give students working examples that they could improve by examining the loop.
Factorial Example Code #1
The code below will calcute the factorial of any number. The problem that you'd have to solve is the extra "*" symbol appended to the final output. The example below uses a "for" loop.
public static void main(String[] args) {
double numberTofactirialize = 10;
double factorial = 0;
String outputFactorial = "";
for(int i =0;i< numberTofactirialize ; i++)
{
outputFactorial += i + "*";
}
System.out.println(outputFactorial);
}
How to watch a loop execute at staggered intervals: use Thread.sleep()
public static void main(String[] args) throws InterruptedException{
String[]strs = {"a","b", "c", "d", "e"};
int i =0;
while(i < strs.length)
{
Thread.sleep(1000); //will iterate once a second
System.out.println(strs[i]);
i++;
}
}
Factorial Example Code #2
The code below will calcute the factorial of any number. The problem that you'd have to solve is the extra "*" symbol appended to the final output. The example below uses a "while" loop but has an error simliar to the first. Try to fix it
Factorial Example Code #1
The code below will calcute the factorial of any number. The problem that you'd have to solve is the extra "*" symbol appended to the final output. The example below uses a "for" loop.
public static void main(String[] args) {
double numberTofactirialize = 10;
double factorial = 0;
String outputFactorial = "";
for(int i =0;i< numberTofactirialize ; i++)
{
outputFactorial += i + "*";
}
System.out.println(outputFactorial);
}
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