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C Exercises: Find the product xyz

C Programming Practice: Exercise-25 with Solution

A Pythagorean triplet is a set of three natural numbers, x < y < z, for which,
x2 + y2 = z2
For example, 32 + 42 = 9 + 16 = 25 = 52.
There exists exactly one Pythagorean triplet for which x +y + z = 1000.
Write a C programming to find the product xyz.

C Code:

#include <stdio.h>
#include <stdio.h>

int main(void)
{
  int x, y;

  for (x = 1; x <= 333; x++) {
    for (y = x; y <= 666; y++) {
      int z = (1000 - x - y);
      if (x*x + y*y == z*z) {
      	printf("Numbers are: %d, %d, %d ", x, y, z);
        printf("\nProduct of x, y, z is : %d", x * y * z);
      }
    }
  }
  return 0;
}

Sample Output:

Numbers are: 200, 375, 425 
Product of x, y, z is : 31875000

Flowchart:

C Programming Flowchart: Find the product xyz.

C Programming Code Editor:

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Previous: Write a C programming to find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?.
Next: Write a C programming to find the sum of all the primes below ten thousand.

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C Programming: Tips of the Day

C Programming - Why do all the C files written by my lecturer start with a single # on the first line?

In the very early days of pre-standardised C, if you wanted to invoke the preprocessor, then you had to write a # as the first thing in the first line of a source file. Writing only a # at the top of the file affords flexibility in the placement of the other preprocessor directives.

From an original C draft by the great Dennis Ritchie himself:

12. Compiler control lines

[...] In order to cause [the] preprocessor to be invoked, it is necessary that the very first line of the program begin with #. Since null lines are ignored by the preprocessor, this line need contain no other information.

That document makes for great reading (and allowed me to jump on this question like a mad cat).

I suspect it's the lecturer simply being sentimental - it hasn't been required certainly since ANSI C.

Ref : https://bit.ly/2Mb8OVZ