Question: Write a program to compute the sum of the n first terms of the series 1 - 2 + 3 - 4 + ... +

Write a program to compute the sum of the n first terms of the series 1 - 2 + 3 - 4 + ... + 1999 - 2000 + .... The number number n is an input of the program.

Example #1 1 Enter the number of terms: 12 2 The sum of the 12 first terms is -6 Example #2 1 Enter the number of terms: 2000 2 The sum of the 2000 first terms is -1000

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