c语言中将输入的正整数进行逆向输出。
c语言中将输入的正整数进行逆向输出。
1、do语句结合while语句
#include <stdio.h>
int main(void)
{
int i;
puts("please input an integer.");
do
{
printf("i = "); scanf("%d", &i);
if (i <= 0)
puts("the range is > 0");
}
while (i <= 0);
if (i > 0)
printf("the reversed: ");
while (i > 0)
{
printf("%d", i % 10);
i /= 10;
}
return 0;
}
↓
#include <stdio.h>
int main(void)
{
int i;
puts("please input an integer.");
do
{
printf("i = "); scanf("%d", &i);
if (i <= 0)
puts("the range is > 0");
}
while (i <= 0);
int reversed = 0;
while (i > 0)
{
reversed = reversed * 10 + i % 10;
i /= 10;
}
printf("the reversed: %d\n", reversed);
return 0;
}
2、编写函数, 没有形参的函数
#include <stdio.h>
int func1(void)
{
int i;
puts("please input an integer.");
do
{
printf("i = "); scanf("%d", &i);
if (i <= 0)
puts("the range is > 0.");
}
while (i <= 0);
return i;
}
int func2(int x)
{
int i = 0;
while (x > 0)
{
i = i * 10 + x % 10;
x /= 10;
}
return i;
}
int main(void)
{
int x = func1();
printf("the reversed: %d\n", func2(x));
return 0;
}