1、
#include <stdio.h>
#define XXX 3
int main(void)
{
int i;
int a[XXX];
int sum = 0;
puts("please input the scores of the students.");
for (i = 0; i < XXX; i++)
{
printf("%dst = ", i + 1);
scanf("%d", &a[i]);
sum += a[i];
}
printf("sum = %5d\n", sum);
printf("mean = %5.1f\n", (double)sum/XXX);
return 0;
}
2、
#include <stdio.h>
#define XXX 5
int main(void)
{
int i;
int a[XXX];
int sum = 0;
puts("please input the scores of the students.");
for (i = 0; i < XXX; i++)
{
printf("%dst = ", i + 1);
scanf("%d", &a[i]);
sum += a[i];
}
printf("sum = %5d\n", sum);
printf("mean = %5.1f\n", (double)sum/XXX);
return 0;
}