# include <stdio.h>
main ( )
{ int i , a[20],s,n;
s=n=0;
for ( i = 0 ;i<20;i ++ ) 1;
for(i=0;i<20;i++)
{ if (a[i]<0)
2;
s+=a[i];n++;
}
printf("s=%d\t,n=%d\n",s,n);
}
//以下程序从键盘输入20个整数存入数组,统计 //输入非负数的个数,并计算输入的非负整数之和。请填空完成。 # include <stdio.h> int main ( ) { int i = 0; int a[5],x = 0,z = 0; while(i<5) { scanf("%d",&a[i]); i++; } i = 0; while(i<5) { if(a[i]>0) x = x+a[i]; else z = z+a[i]; i++; } printf("正数为:%d\n负数为:%d",x,z); return 0;