分享一下自己的思考，請指教
針對正方形的對角線求和的一點思考，代碼如下：
#include <stdio.h>
#define N 6
int main()
{
? ? int arr[N][N];
? ? int i,j;
? ? int sum=0;
? ? for(i=0;i<N;i++)? ? ? ? ?//可用隨機數賦值，這里簡單點測試
? ? {
? ? ? ? for(j=0;j<N;j++)
? ? ? ? arr[i][j]=1;? ?
? ? }
? ?for(i=0;i<N;i++)? ? ? ?//打印出來看看?
? ? {
? ? ? ? for(j=0;j<N;j++)
? ? ? ? printf("%4d",arr[i][j]);?
? ? ? ? printf("\n");? ?
? ? ?}
? ? for(i=0;i<N;i++)
? ? {
? ? ? ?for(j=0;j<N;j++)
? ? ? ?{
? ? ? ? ? ?if(i+j==N-1||i==j)
? ? ? ? ? ? ? ?sum+=arr[i][j];
? ? ? ?}? ? ? ?
? ? }
? ? printf("對角線元素之和是：%d\n",sum);
? ? return 0;? ??
}
2022-04-01
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