#include <stdio.h>
int main()
{
int sum=0,i,j;
int m[4][4]={1,2,3,4,2,3,4,5,3,4,5,6,4,5,6,7};
for(i=0; i<4; i++)
{
for(j=0; j<=i; j++) sum += m[i][j];
printf("%d", sum);
return 0;
}
#include <stdio.h>
int main()
{
int sum=0,i,j;
int m[4][4]={1,2,3,4,2,3,4,5,3,4,5,6,4,5,6,7};
for(i=0; i<4; i++)
{
for(j=0; j<=i; j++) sum += m[i][j];
printf("%d", sum);
return 0;
}
二维数组主对角线左边的所有数之和(含对角线上的数),循环次数=1+2+3+4=10次