#### Series Program in Loop Program – 2

Series loop program are very useful for high programming. In this blog we will see hard programs. We already know simple blog in last blog.

In this blog, we will discuss inbuilt Math class and pow(i,2) method. Math is inbuilt class and this class has many methods like sqrt(), cos(), tan() etc. We will discuss on pow() method.

**Series Loop Program: 1^2+2^2+3^2+…+n^2 = ….**

class loop8

{

public static void main(String args[])

{

int i;

int n = Integer.parseInt(args[0]);

double sum=0;

for(i=1;i<=n;i++)

{

//sum = sum + i*i;

sum = sum + Math.pow(i,2); // inbuilt class and method

}

System.out.println(“1^2+2^2+…+”+n+”^2=”+sum);

}

}

**Output:**

Command line Value is: 5

1^2+2^2+…+5^2 = 55

**Series Loop Program: 1! + 2! + 3! + … + n! = …..**

class loop9

{

public static void main(String args[])

{

int i;

int n = Integer.parseInt(args[0]);

int sum=0,fact,j;

for(i=1;i<=n;i++)

{

fact = 1;

for(j=1;j<=i;j++) // Nested Loop

{

fact = fact * j;

}

sum = sum + fact;

}

System.out.println(“1!+2!+…+”+n+”!=”+sum);

}

}

**Output:**

Command line Value is: 5

1!+2!+…+”+5+”!= 153

#### List Of Tutorial on Series Loop Program.

No | Title |

1 | 1^2-2^2+3^2-…+-n^2 = …. |

2 | 1^1+2^2+3^3+…+n^n = …. |

3 | -1^1+2^2-3^3+…+-n^n = …. |

4 | 1! – 2! + 3! – 4! + 5! – 6! + 7! = …… |

**If you have problem on this blog, you can directly comment on it. This tutorial will help you understand the concepts of java loop programs.**

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