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Alternative for 'GOTO' function in java?
I know that Goto is a reserved function in java,i wonder if there is any alternatives to it.I could not understand how to use label and continue instead of goto.
Here am presenting a C code to friend the prime numbers which has goto function employed in it.I want you to re-write this code using java with the same functionalities.
#include <stdio.h>
#include <conio.h>
void main()
{
int n,m,k,i,max;
char c;
clrscr();
repeat: max=0;
k=2;
n=1;
printf("You want prime numbers upto:- ");
scanf("%d",&max);
printf("
");
for (i=1;i<=max;i++)
{
again: m=(n/k)*k;
if (m!=n)
k=k+1;
else
goto try1;
if (k < n/2)
goto again;
else
printf("%d",n);
printf(" ");
try1: n=n+1;
k=2;
}
fflush(stdin);
printf ("
Do you want to continue?(y/n):- ");
scanf("%c",&c);
if (c=='y')
goto repeat;
getch();
}
please help me,iam new to java.
PS:Sorry for the confusing code,using goto labels will make the code confusing,but it is a powerful construct .what to do if i want an action to be repeated based on the user input,as in the above program?
3 Answers
- 1 decade ago
REPLACE your label (repeat) with
while(true)
REPLACE your whole goto thing with
if(c!= 'y')break;
This is already pretty poor code in C. getch() isn't a portable function between compilers, if/else clauses should be blocks even if they're a single statement, using "try1" as a label, no functions...
--------------------------------------------------
what to do if i want an action to be repeated based on the user input
What you do is what I said above. Put an infinite loop around what you want to run and use a
"if(userInput means break the loop) break";
This is what it should look like (except I haven't bothered with input validation and in true C spirit, I decided that if you pass things to functions that you shouldn't then you get crazy results.):
- 1 decade ago
The goto construct is highly abused in all programming languages by novices. Create a function, and call the function when needed, instead of jumping around in your script.
