所以,我正在尝试让这个 C 代码工作。它编译,但产生不正确的输出。它应该列出 1 和选定值之间的所有完美平方数。 它做错了什么,经过大量试验和错误后,我认为问题出在模数运算上......比如它提前截断或做一些其他奇怪的事情。
// C Code
/*This program will identify all square numbers between one and a chosen integer*/
#include <stdio.h>
#include <math.h>
int main(){
int i, upper, square_int;
float square;
printf("This program will identify all square numbers between one and a chosen integer");
printf("Please enter the upper limit integer:");
scanf("%d", &upper);
upper = 13; /*scanf is the primary integer input method; this is here just to test it on codepad*/
for (i = 1; i<= upper; ++i) /*i want to run through all integers between 1 and the value of upper*/
{
square = sqrt(i); /* calc square root for each value of i */
square_int = square; /* change the root from float to int type*/
if (i % (int)square_int == 0) /*check if i divided by root leaves no remainder*/
printf("%d\n", i); /*print 'em*/
}
printf("This completes the list of perfect squares between 1 and %d",upper);
return 0; /*End program*/
}
键盘上的输出是:
This program will identify all square numbers between one and a chosen integerPlease enter the upper limit integer:1
2
3
4
6
8
9
12
This completes the list of perfect squares between 1 and 13
这当然是错误的。我希望得到 1、2、4 和 9。谁能指出我在这里搞砸了?
最佳答案
这里有一个更简单的算法
int i = 1;
while (i*i < upper)
{
printf("%d\n", i*i);
++i;
}
另一种方法是计算平方根,将其转换为 int,然后比较数字。
for (i = 1; i <= upper; ++i)
{
square = sqrt(i);
square_int = square;
if (square == (float)square_int)
printf("%d\n", i );
}
关于嵌套 If 的 C 代码 For 循环;模数和 sqrt 问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29283657/