1、while语句
#include <stdio.h>
int main(void)
{
int i = 2, j;
puts("please input an integer.");
do
{
printf("j = "); scanf("%d", &j);
if (j <= 2)
puts("the range of j is : > 2");
}
while (j <= 2);
while (i <= j)
{
printf("%d ", i);
i *= 2;
}
putchar('\n');
return 0;
}
2、for语句
#include <stdio.h>
int main(void)
{
int i, j;
puts("please input an integer.");
do
{
printf("j = "); scanf("%d", &j);
if (j <= 2)
puts("the range of j is : > 2.");
}
while (j <= 2);
for (i = 2; i <= j; i *= 2)
{
printf("%d ", i);
}
putchar('\n');
return 0;
}
3、do语句
#include <stdio.h>
int main(void)
{
int i = 2, j;
puts("please input an integer.");
do
{
printf("j = "); scanf("%d", &j);
if (j <= 2)
puts("the range of j is : > 2 ");
}
while (j <= 2);
do
{
printf("%d ", i);
i *= 2;
}
while (i <= j);
putchar('\n');
return 0;
}
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