Write a C program to print the sum of the first 89 natural numbers.

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Q. Write a C program to print the sum of the first 89 natural numbers.

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Concept understanding — Loop and Jump Control Statements (while, do-while, for, break, continue)

Loop (iterative) control statements repeat a block of statements as long as a condition holds, which lets a program perform a task many times without rewriting it. C provides three loops.

while loop - an entry-controlled loop: the condition is tested first, so the body may run zero times.
```
while (condition)
{ ... }
```
do-while loop - an exit-controlled loop: the body runs once first and the condition is tested afterwards, so it always executes at least once.
```
do
{ ... }
while (condition);
```
for loop - a compact loop that gathers the initialisation, test and update in one line: for (i=1; i<=n; i++). It is the natural choice when the number of repetitions is known.

Loops are used to add a series of numbers, print a name a fixed number of times, or process a menu repeatedly.

Jump statements change this normal flow from inside a loop: …

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[!TLDR]

Loop i from 1 to 89 adding each value; the sum of the first 89 natural numbers is 4005.

The first 89 natural numbers are 1, 2, 3, ..., 89. A for loop runs the index from 1 to 89 and accumulates the total in sum. (The same result is given by the formula $\dfrac{n(n+1)}{2}=\dfrac{89\times 90}{2}=4005$ .)

#include <stdio.h>
int main()
{
    int i, sum = 0;
    for (i = 1; i <= 89; i++)
        sum += i; …

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Q.Write a C program to print the sum of the first 89 natural numbers.

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