在C中扫描和打印可变数据类型“double”
我正在学习算法,很想学习。 我的问题是,我不能使用C中的整数数据类型输出数字“600851475143”。所以我切换到双打。 但是输出是“0.0000”。 有人可以告诉我我做错了什么吗? 我只是想扫描并打印双数据类型中的任何数字,然后我将重点放在获取最高的主要因素:)
#include <stdio.h>
#include <math.h>
int main()
{
double number;
double div = 2;
double highest = 2;
printf("Please input a number: ");
scanf("%lf", &number);
printf("n You entered: %lf", &number);
while(number!=0){
if(fmod(number,div) != 0){div = div + 1;}
else{
number = number / div;
printf("n %lf", div);
if(highest < div){highest = div;}
if(number == 1){break;}
}
}
printf("n The highest number is %lf", highest);
return 0;}
我做了什么:
在google搜索“scan double in c”,了解到“%lf”是正确的路要走,但程序没有显示任何内容。
我检查了Stackoverflow中的各种问题,如:
为什么scanf需要用于双打
用c中的scanf读取double值
浮动和双重之间的区别
在C文件中读取和写入(加倍)
从文件读取和写入双精度
浮点与双精度
用c中的scanf读取double值
http://www.technoburst.net/2011/07/reading-double-in-c-using-scanf.html
谢谢你用你的知识来启发我。
用带警告的编译器进行编译显示了这个问题:
dbl.c:13:31: warning: format specifies type 'double' but the argument has type
'double *' [-Wformat]
printf("n You entered: %lf", &number);
~~~ ^~~~~~~
1 warning generated.
将该行更改为:
printf("n You entered: %lf", number);
您正在尝试打印号码的地址而不是号码。
另外,尝试在最后添加一个换行符:
printf("n The highest number is %lfn", highest);
因为,你正在使用整数,但是,我建议你只用很long long
,假设你有一个C99编译器:
#include <stdio.h>
#include <math.h>
int main()
{
long long number;
long long div = 2;
long long highest = 2;
printf("Please input a number: ");
scanf("%lld", &number);
printf("n You entered: %lld", number);
while(number!=0){
if(number % div != 0){div = div + 1;}
else{
number = number / div;
printf("n %lld", div);
if(highest < div){highest = div;}
if(number == 1){break;}
}
}
printf("n The highest number is %lldn", highest);
return 0;}
为了可读性,您还可以重新格式化您的代码:
#include <stdio.h>
#include <math.h>
int main() {
long long number, div, highest;
div = highest = 2;
printf("Please input a number: ");
scanf("%lld", &number);
printf("n You entered: %lld", number);
while(number != 0) {
if (number % div != 0) div += 1;
else {
number /= div;
printf("n %lld", div);
if (highest < div) highest = div;
if (number == 1) break;
}
}
printf("n The highest number is %lldn", highest);
return 0;
}
我还建议换行符略有不同,这会给你留下:
#include <stdio.h>
#include <math.h>
int main() {
long long number, div, highest;
div = highest = 2;
printf("Please input a number: ");
scanf("%lld", &number);
printf("n You entered: %lldn", number);
while(number != 0) {
if (number % div != 0) div += 1;
else {
number /= div;
printf("%lldn", div);
if (highest < div) highest = div;
if (number == 1) break;
}
}
printf("The highest number is %lldn", highest);
return 0;
}
问题出在函数printf("%lf",&number)
应该是printf("%lf",number)
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