[linux] 반복문( while )

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c 언어에서 반복문 

for 문
while 문
do ~ while 문

until 문 X

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LAB> while 문 예제 1


# vi while1.c 
-- while1.c --
#include <stdio.h>   // printf, scanf, fflush, putchar
#include <unistd.h>  // sleep

int main()
{
  int i;
  int j;

  printf("반복할 숫자를 넣으세요 : ");
  scanf("%d", &i);

  while(i)
  {
    printf(".");
    fflush(stdout);
    sleep(1);
    i = i - 1;
  }

  putchar('\n');

  return 0;
}
-- while1.c --

- -Wall (모든경고)를 표시하는 옵션
# gcc -Wall -o while1 while1.c
while1.c: In function 'main':
while1.c:7: warning: unused variable 'j'
# ./while1 
반복할 숫자를 넣으세요 : 3
...

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