Question

C语言求1+1+2+3+5+8+....前20项的和求编程

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace GetDate
{
class Date
{
public int[] GetDate()
{
int[] iArray = new int[30];
iArray[0] = 1;
iArray[1] = 1;
for (int i = 2; i < 30;i++ ) {
iArray[i] = iArray[i - 1] + iArray[i - 2];
}
return iArray;
}

}
}

然后在Main方法里调用该方法获得30个数。输出

Answer 2

main()
{int i,sum=0;
for(i=1;i<20;i++)
sum=sum+i;
printf("SUM=%d",sum);
}

搞那么复杂干什么。

Answer 3

int sum=0,i,a[20]={1};
for(i=2;i<20;i++)
a[i]=a[i-1]+a[i-2];
for(i=0;i<20;i++)
sum+=a[i];
printf("%d",sum);

Answer 4

int preFirst=1,preSecond=1,current=0,sum = preFirst + preSecond ;
for(int i=2;i<20;i++,preFirst=preSecond,preSecond=current)
{
current = preFirst + preSecond;
sum += current;
}

Answer 5

#include <stdio.h>

void main()
{
int f1 = 1,f2 = 1,i,sum;
sum = f1+f2;
for(i = 0; i<9; i++)
{
f1=f1+f2;
f2=f1+f2;
sum = sum+f1+f2;
}
printf("sum=%d\n",sum);

}