conditional if statement

i want use if satement, to do something for the one time, example:

main(){
char k;
k=0;

while(1){

if(k==0){
printfLCD("please only one time\n");
k=1;
}//end if

printfLCD("test message\n");

}//end while
}//end main

but it isnt work, program enters the if statement infinite time. where is the error?, there is anyything about keilc51, which is i dont know? i use upsd3434 8051 microcontroler, sory for my nglish