#include <stdio.h>
int main()
{
int arr[3][3] = {{1,2,3},{4,5,6},{7,8,9}};
int i,j;
int sum=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
if ((i + j == 2) || (i - j == 0) )
{
sum += arr[i][j];
}
}
}
printf("对角线元素之和是：%d\n",sum);
return 0;
}
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http://physics.scu.edu.cn/search ... A%76%78%67%6A%79%66
http://physics.scu.edu.cn/search ... 0%8F%6B%67%7A%62%70
http://physics.scu.edu.cn/search ... F%71%63%62%75%77%77
http://physics.scu.edu.cn/search ... B%6B%64%6B%75%61%6E
http://physics.scu.edu.cn/search ... 2%76%74%6F%74%76%6D
http://physics.scu.edu.cn/search ... 0%8F%6D%61%75%76%65
想到了，应该是for循环的嵌套，第一层for循环执行每一行的遍历，所以实际上每一行都只有一次查找，不会有重复的情况；