❶ C语言将一个二维数组的下三角矩阵（含对角线）的元素清零后显示。(注：数组初值自己随意初始化)
/*
93 85 97 80 91 90
83 94 68 68 63 90
75 87 90 96 79 83
82 74 65 72 95 83
85 68 98 78 69 91
93 72 82 94 100 67
0 85 97 80 91 90
0 0 68 68 63 90
0 0 0 96 79 83
0 0 0 0 95 83
0 0 0 0 0 91
0 0 0 0 0 0
Press any key to continue
*/
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#defineM6
#defineN6
voidClearLeftBottom(inta[][N],intm){
inti,j;
for(i=0;i<m;++i)
for(j=0;j<=i;++j)
a[i][j]=0;
}
voidShow(inta[][N],intm){
inti,j;
for(i=0;i<m;++i){
for(j=0;j<N;++j)
printf("%5d",a[i][j]);
printf(" ");
}
printf(" ");
}
intmain(){
inta[M][N],i,j;
srand((unsigned)time(NULL));
for(i=0;i<M;++i)
for(j=0;j<N;++j)
a[i][j]=rand()%40+61;
Show(a,M);
ClearLeftBottom(a,M);
Show(a,M);
return0;
}