Question

c语言 二维数组 对角线相加

程序出错，运行不了，求改正，使得这个程序可以输出二维数组aa对角线上的元素的和

#include<stdio.h>
#define M 5
int fun(int n,int xx[][M])
{
int i,j,sum=0;
printf("\nthe %d x %d matrix :\n",M,M);
for(i=0;i<M;i++)
{for(j=0;j<M;j++)
printf("%d",xx[i][j]);
printf(\n);
}
for(i=0;i<n;i++)
sum+=xx[i][i]+xx[i][n-i-1];
return sum;
}

main()
{int aa[M][M]={{1,2,3,4,5},{4,3,2,1,0},{6,7,8,9,0},{9,8,7,6,5},{3,4,5,6,7}};
printf("\nthe sum of elements on 2 dignals is %d",fun(M,aa));
}

Answer 1

正确代码

#include<stdio.h>
#define M 5
int fun(int n,int xx[][M])
{
int i,j,sum=0;
printf("\nthe %d x %d matrix :\n",M,M);

for(i=0;i<M;i++)
{
for(j=0;j<M;j++)
printf("%3d",xx[i][j]);
printf("\n");
}

for(i=0;i<n;i++)
sum=sum+xx[i][i];

return sum;

}

main()
{
int aa[M][M]={{1,2,3,4,5},{4,3,2,1,0},{6,7,8,9,0},{9,8,7,6,5},{3,4,5,6,7}};
printf("\nthe sum of elements on 2 dignals is %d\n",fun(M,aa));
}

追问

我可能没说清，指的是两个对角线之和，
把你的代码求和那里改成sum=sum+xx[i][i]+xx[i][n-i-1];就对了，
感谢~