鏂規硶涓: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;
}
鏂規硶浜?姣旇搗涓婁竴涓▼搴忥紝絎簩涓秹鍙婂埌涔樻硶鎸囦護鐨勮鍙ユ敼涓烘墽琛屽姞娉曟寚浠わ紝鏃㈣揪鍒拌棰樼洰鐨勮姹傝屼笖榪愮畻鏃墮棿涓婄緝鐭簡寰堝錛佽屼唬浠蜂粎浠呮槸澧炲姞浜嗕竴涓暣鍨嬪彉閲忥紒
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;
}
鏄緢寮烘倣鍚?鎴戣榪囦簡鍢?鏄秺鏉ヨ秺浼樺櫥~
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