鏂規(guī)硶涓:渚濇寰幆
#include<stdio.h>
#include<stdlib.h>
long fn(long n);
int main(void)
{ long n=0;
printf("input n\n");
scanf("%ld",&n);
printf("result=:%ld",fn(n));
system("pause");
return 0;
}
long fn(long n)
{
long temp=0;
int i,flag=1;//鐢‵LAG鎺у埗姝ｈ礋鍙風(fēng)殑浜ゆ浛 ,I 浠?寰幆鍒癗
if(n<=0)
printf("error: n must > 0");
for(i=1;i<=n;i++){
temp=temp+flag*i;
flag=(-1)*flag;}
return temp;
}
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瀹炵幇鍏ㄧ爜:
long fn(long n)
銆銆{
銆銆long temp=0;
銆銆int j=1,i=1,flag=1;
銆銆if(n<=0)
銆銆{
銆銆printf("error: n must > 0);
銆銆exit(1);
銆銆}
銆銆while(j<=n)
銆銆{
銆銆temp=temp+i;
銆銆i=-i;
銆銆i>0?i++:i--;
銆銆j++;
銆銆}
銆銆return temp;
銆銆}
鏂規(guī)硶涓?鐩存帴璺寵繃寰幆!!!鏁翠綋涓婄湅,鑰冭檻鍒?-2+3-4+.....n鐨勮寰?. 鍏跺肩瓑浜庝腑闂存暟..
瀹炵幇浠ｇ爜濡備笅:
long fn(long n)
{
銆銆if(n<=0)
銆銆{
銆銆printf("error: n must > 0");
銆銆exit(1);
銆銆}
銆銆if(0==n%2)
銆銆return (n/2)*(-1);
銆銆else
銆銆return (n/2)*(-1)+n;
}
鏄緢寮烘?zhèn)嶅?鎴戣榪囦簡鍢?鏄秺鏉ヨ秺浼樺櫥~
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