#include<stdio.h>int main(){? double a[4][5];?? int b,c,d,e;??? printf("請(qǐng)輸入一個(gè)4乘5的矩陣：\n");??? for(b=0;b<4;b++)??? {??????? for(c=0;c<5;c++)??????? {??????????? printf("請(qǐng)輸入a[%d][%d]：",b,c);??????????? scanf("%lf",&a[b][c]);?? ??????? }??? }? for(b=0;b<4;b++)??? {??????? for(c=0;c<5;c++)??????? {???????? if(a[b][c]<0.0)??????????? {????????????? printf("第%d行%d列的元素%.2f小于0\n",b+1,c+1,a[b][c]);??????????? }???? ??? }}?return 0;??? }