void foo( void ){ printf("foo\n");}
//......
int main( void) {
 unsigned char x = 9; /* кол-во проходов */
switch(x & 3) default: while((x-=4) < 200) {
     foo(); case 3:
     foo(); case 2:
     foo(); case 1:
     foo(); case 0:;
}
printf("Done!\n");