#include
#define N 4
main()
{
int i,j,a[N][N]={{3,5,6,3},{0,8,9,1},{0,0,5,0},{0,0,0,7}};
for(i = 0;i < N; ++i) {
for(j = 0; j < N; ++j) {
if(j < i) printf(" ");
else printf("%3d",a[i][j]);
}printf("\n");
}
}
//這個已經(jīng)試驗過了,給你的一樣,若你的數(shù)有規(guī)律,或者想要隨機(jī)數(shù)就用一樓的