C 语言实例 - 计算自然数的和
C 语言教程
· 2019-02-20 18:14:31
自然数是指表示物体个数的数，即由0开始，0，1，2，3，4，……一个接一个，组成一个无穷的集体，即指非负整数。
实例 - 使用 for
#include <stdio.h>
int main()
{
int n, i, sum = 0;
printf("输入一个正整数: ");
scanf("%d",&n);
for(i=1; i <= n; ++i)
{
sum += i; // sum = sum+i;
}
printf("Sum = %d",sum);
return 0;
}
实例 - 使用 while
#include <stdio.h>
int main()
{
int n, i, sum = 0;
printf("输入一个正整数: ");
scanf("%d",&n);
i = 1;
while ( i <=n )
{
sum += i;
++i;
}
printf("Sum = %d",sum);
return 0;
}
运行结果：
输入一个正整数: 100 Sum = 5050
实例 - 使用递归
#include <stdio.h>
int addNumbers(int n);
int main()
{
int num;
printf("输入一个整数: ");
scanf("%d", &num);
printf("Sum = %d",addNumbers(num));
return 0;
}
int addNumbers(int n)
{
if(n != 0)
return n + addNumbers(n-1);
else
return n;
}
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Handbook of Data Structures and Applications
Dinesh P. Mehta / Chapman and Hall/CRC / 2004-10-28 / USD 135.95
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