Chandu - 7 months ago 22
Java Question

# Printing consecutive numbers

I have sorted integer array {1,2,3,7,9,24,25,26,78} and would like to print consecutive to print {1-3,7,9,24-26,78}. That is, every time there is a set of consecutive numbers occurring in the array, I would like to print out the range from the minimum number to the maximum number.

``````import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Consecutive{

public static void main(String[] args){
int[] a={1,2,3,7,9,24,25,26,78};

for(int i=0;i<a.length;i++){
int count=0;
int first=0;

/*  System.out.println(i);*/
first=a[i];

if(a[i+1]-a[i]==1){

count++;

int last=a[i]+count;
i++;
System.out.println(first + " " + last);

}else{

System.out.println(a[i]);

}

}
}
}
``````

You could do something like this:

``````    if(a.length>0) {
int i=0,j=0;
do{
j=i+1;
while(j<a.length){
if(a[j]-a[i]!=j-i)
break;
j++;
}
if(i==j-1)
System.out.println(a[i]);
else
System.out.println(a[i] + "-" + a[j-1]);
i=j;
}while(i<a.length);
}
``````

I hope it helps.

Source (Stackoverflow)