This is the program for printing the numbers in the below format:
1
3*2
4*5*6
10*9*8*7
11*12*13*14*15
Method 1:
1
3*2
4*5*6
10*9*8*7
11*12*13*14*15
Method 1:
public void printFormat1(){
int num = 10;
for(int i = 1; i <= num; i++){
System.out.println(formString("",getStartNum(i),i,(i%2 == 0 ? -1 : 1)));
}
}
public int getStartNum(int num){
int incrRdecr = num%2 == 0 ? -1 : 1;
int sum = (num * (num+1))/2;
if(incrRdecr == 1){
return sum - num + 1;
}else{
return sum;
}
}
public String formString(String str, int startNum,
int countNum, int incrCount){
String resp;
if(countNum == 0){
str = (str + startNum);
resp = str.substring(0, str.lastIndexOf("*"));
return resp;
}else{
resp = formString(str + startNum + "*",(startNum + incrCount),--countNum, incrCount);
return resp;
}
}
