計算并輸出數(shù)組中所有正數(shù)之和所有負數(shù)之和？

#include<stdio.h>

void main()

{

int i,j,b[3][4],s1=0,s2=0;

printf("請輸入數(shù)組：\n");

for(i=0;i<3;i++)

for(j=0;j<4;j++)

{

scanf("%d",&b[i][j]);

if(b[i][j]>0)

s1+=b[i][j];

else

s2+=b[i][j];

}

printf("所有正數(shù)之和為：%d\n",s1);

printf("所有負數(shù)之和為：%d\n",s2);

}