C'de hazırladığım programa görsellik

 
  #include<stdio.h> 
  #include<windows.h> 
  int secim; 
  void rengim(int renk) 
  { 
   HANDLE hStdout; 
   hStdout = GetStdHandle(STD_OUTPUT_HANDLE); 
   SetConsoleTextAttribute(hStdout, renk); 
  } 
  int topla(int sayi1 ,int sayi2) 
  { 
   return (sayi1+sayi2); 
  } 
  int cikar(int sayi1 ,int sayi2) 
  { 
   return (sayi1-sayi2); 
  } 
  int carp(int sayi1 ,int sayi2) 
  { 
   return (sayi1*sayi2); 
  } 
  int bol(int sayi1 ,int sayi2) 
  { 
   if(sayi2!=0) 
   return (sayi1/sayi2); 
  } 
  void gotoxy(short x, short y) 
  { 
   HANDLE hConsoleOutput; 
   COORD Cursor_Pos={x-1,y-1}; 
   hConsoleOutput=GetStdHandle(STD_OUTPUT_HANDLE); 
   SetConsoleCursorPosition(hConsoleOutput,Cursor_Pos); 
  } 
  void cerceve(int x1,int x2,int y1,int y2) 
  { 
   int i,j; 
   for(i=x1;i<=x2;i++) 
   { 
   gotoxy(i,y1);printf("%c",196); 
   gotoxy(i,y2);printf("%c",196); 
   } 
   for(j=y1;j<=y2;j++) 
   { 
   gotoxy(x1,j);printf("%c",179); 
   gotoxy(x2,j);printf("%c",179); 
   } 
   gotoxy(x1,y1);printf("%c",218); 
   gotoxy(x2,y1);printf("%c",191); 
   gotoxy(x2,y2);printf("%c",217); 
   gotoxy(x1,y2);printf("%c",192); 
  } 
  void baslangic() 
  { 
   int i,j; 
   gotoxy(25,20);printf(" MEHMET CEYLAN "); 
   gotoxy(20,14);printf("HESAP MAKINASI YUKLENIYOR"); 
   for(j=15;j<=50;j++) 
   { 
   gotoxy(j,16);printf("%c",196); 
   gotoxy(j,18);printf("%c",196); 
   } 
   for(i=15;i<=50;i++) 
   { 
   rengim(4); 
   gotoxy(i,17);printf("%c",177); 
   Sleep(100); 
   rengim(7); 
   } 
  } 
  void menu() 
  { 
   system("cls"); 
   cerceve(1,15,1,15); 
   rengim(4); 
   gotoxy(2,2);printf("ISLEMLER\n"); 
   gotoxy(2,3);printf("--------"); 
   rengim(5); 
   gotoxy(2,4);printf("1-TOPLAMA"); 
   rengim(6); 
   gotoxy(2,6);printf("2-CIKARMA"); 
   rengim(3); 
   gotoxy(2,8);printf("3-CARPMA"); 
   rengim(8); 
   gotoxy(2,10);printf("4-BOLME"); 
   rengim(7); 
   gotoxy(2,12);printf("Seciminiz:"); 
   scanf("%d",&secim); 
  } 
  main() 
  { 
   int say1,say2; 
   baslangic(); 
   Sleep(300); 
   menu(); 
   cerceve(25,60,1,20); 
   gotoxy(30,2);printf("1.sayiyi gir: ");scanf("%d",&say1); 
   gotoxy(30,3);printf("2.sayiyi gir: ");scanf("%d",&say2); 
   switch(secim) 
   { 
   case 1: 
   { 
   rengim(5); 
   gotoxy(35,6);printf("%d",say1); 
   gotoxy(35,8);printf("%d",say2); 
   gotoxy(30,9);printf("+"); 
   gotoxy(30,10);printf("---------"); 
   gotoxy(35,11);printf("%d",topla(say1,say2)); 
   break; 
   } 
   case 2: 
   { 
   rengim(6); 
   gotoxy(35,6);printf("%d",say1); 
   gotoxy(35,8);printf("%d",say2); 
   gotoxy(30,9);printf("-"); 
   gotoxy(30,10);printf("---------"); 
   gotoxy(35,11);printf("%d",cikar(say1,say2)); 
   break; 
  } 
   case 3: 
   rengim(7); 
   { 
   gotoxy(35,6);printf("%d",say1); 
   gotoxy(35,8);printf("%d",say2); 
   gotoxy(30,9);printf("x"); 
   gotoxy(30,10);printf("---------"); 
   gotoxy(35,11);printf("%d",carp(say1,say2)); 
   break; 
   } 
   case 4: 
   { 
   rengim(8); 
   gotoxy(35,6);printf("%d",say1); 
   gotoxy(34,7);printf("----"); 
   gotoxy(35,8);printf("%d",say2); 
   gotoxy(30,9);printf("="); 
   gotoxy(30,10);printf("---------"); 
   gotoxy(35,11);printf("%d",bol(say1,say2)); 
   break; 
   } 
   default: 
   { 
   printf("yanlis secim"); 
   } 
   } 
   gotoxy(1,24); 
  getchar(); 
  getchar(); 
    
  }