===== C =====
     1 double sum;
      2 double leibniz_pi( ) {
      3         double n = 0;
      4         while( n < 40000000 ) {
      5                 sum = sum + (pow(-1, n))/((2.0 * n ) + 1);
      6                 n++;
      7         } 
      8 } 
      9  
     10 main() {
     11         leibniz_pi();
     12         printf("c leibniz: %f\n", sum*4 );
     13 }
     14      
     15 


==== JAVA ====
      1 
      2 public class JavaLeibniz {
      3         public static void main(String[] args) {
      4                 double sum = 0;
      5                 double n = 0;
      6                 while( n < 40000000 ) {
      7                         sum = sum + (Math.pow(-1.0, n))/((2.0 * n ) + 1);
      8                         n++;
      9                 }
     10         }
     11 }