C de fonksiyon;

#include <stdio.h> 
  #include <stdlib.h> 
  #include <conio.h> 
  int sonucHesapla(int ,int ); 
   
  int main() 
  { 
    int x,y=-20,sonuc; 
    printf("\t\tx\ty\tSonuc\n"); 
    printf("\t------------------------------------\n"); 
    for(x=0;x<21;x++); 
    { 
                      sonuc=sonucHesapla(x,y); 
                      printf("\t\t%d\t%d\t%d\n",x,y,sonucHesapla(x,y)); 
                      y++; 
    } 
    system("PAUSE");	 
    return 0; 
  } 
  int sonucHesapla(int x,int y) 
      { 
                       int sonuc; 
                       sonuc=(3*(x*x))+(5*x*y)-25; 
                       return sonuc; 
      }