C Program to Calculate Sum of Alternating Integers

The program calculates the sum of the first 99 integers alternating between positive and negative signs.

The variable 'i' is initialized to 1 and used in the loop condition to iterate through the numbers 1 to 99.

The variable 'sn' (short for 'sum') is initialized to 0 and used to keep track of the running total.

The variable 'sign' is initialized to 1 and is used to alternate the signs of the integers being added to the sum.

Inside the loop, 'sn' is updated by adding the current value of 'i' multiplied by 'sign'.

The value of 'sign' is then changed to its opposite by multiplying it by -1, which will make the next term in the sum have the opposite sign.

After the loop finishes, the final value of 'sn' is printed to the console using the printf function.

Overall, the program is a simple example of using loops and variables to perform a mathematical calculation.