Question

c语言二维整型数组

Answer 1

#include "stdio.h"
#include "stdlib.h"
#include "time.h"
#define N 7
int main(void){
    int a[N][N],i,j;
    srand((unsigned)time(NULL));
    for(i=0;i<N;i++){
        for(j=0;j<N;j++)
            printf("%3d",a[i][j]=rand()%30);
        printf("\n");
    }
    printf("\n");
    for(i=0;i<N;i++){
        for(j=0;j<N;printf("%3d",a[i][j++]))
					if(j<=i) a[i][j]*=3;
        printf("\n");
    }
    return 0;
}