URI 1007 - Difference || Solution in C / C++

Read four integer values named A, B, C and D. Calculate and print the difference of product A and B by the product of C and D (A * B - C * D).

Input

The input file contains 4 integer values.

Output

Print DIFERENCA (DIFFERENCE in Portuguese) with all the capital letters, according to the following example, with a blank space before and after the equal signal.

Input Samples	Output Samples
5 6 7 8	DIFERENCA = -26

0 0 7 8

DIFERENCA = -56

5 6 -7 8

DIFERENCA = 86

SOURCE CODE

#include <stdio.h>

int main() {
  int a, b, c, d, DIFERENCA;

  scanf("%d %d %d %d", & a, & b, & c, & d);
  DIFERENCA = ((a * b) - (c * d));
  printf("DIFERENCA = %d\n", DIFERENCA);

  return 0;
}