C Exercises: Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum

Last update on May 27 2022 12:24:22 (UTC/GMT +8 hours)

C Programming Practice: Exercise-22 with Solution

The sum of the squares of the first ten natural numbers is,
1² + 2² + ... + 10² = 385
The square of the sum of the first ten natural numbers is,
(1 + 2 + ... + 10)² = 55² = 3025
Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 − 385 = 2640.
Write a C programming to find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.

C Code:

#include <stdio.h>
int main(void)
{
  unsigned sum1 = 0, sum2 = 0, i;
  for (i = 1; i <= 100; i++) {
    sum1 += i*i;
    sum2 += i;
  }
  printf("%u\n", sum2*sum2 - sum1);
  return 0;
}

Sample Output:

25164150

Flowchart:

C Programming Code Editor:

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP