菜鸟求解一道题

[sunshixu]

Two variables, num and cost have been declared and given values: num is an integer and cost is a double. Write a single statement that outputs num and cost to standard output. Print both values (num first, then cost), separated by a space on a single line that is terminated with a newline character. Do not output any thing else.
两个变量，数量和成本已经宣布与给定值：num是一个整数和成本是增加一倍。写一个声明，产出的数量和费用标准输出。打印这两个值（招先，然后费用），由一个单一行与一个换行符终止空格分开。不输出任何事情。

[sduxiaoxiang]

printf("%d %f",num,cost);

[z569362161]

什么意思？数量和成本已经宣布与给定值
num是一个整数和成本是增加一倍?????更不明白。


printf("");

[sduxiaoxiang]

自己翻译个。。。这翻译牛气了

[mstlq]

printf("%d %f\n",num,cost);

[mstlq]

看汉语看呆了……

还是看英文明白题意的……

[selooloo]

printf("\n%d %lf\n",num,cost);
cost is a double

[mstlq]

[Quote=引用 6 楼 selooloo 的回复:]
printf("\n%d %lf\n",num,cost);
cost is a double
[/Quote]
printf函数中
%f就是double……
%lf是未定义行为，慎用……

不过在scanf中
%lf和%f确实有着double还是float的区别……

[tmdiloveu]

請教 printf("\n%d %lf\n",num,cost);
為何要在%d前面加入\n ， %d %f中間一定要有空格嗎