In case of unknown number of integers to be read, we could use EOF to tell C program the end of input.
In linux system, we can use Control-D to initiate EOF, while in windows system, we use Control-Z to initiate EOF, when input from keyboard.
For example,
#include<stdio.h>
int main()
{
int num;
int count = 0;
int total = 0;
while(scanf("%d", &num) != EOF)
{
total = total + num;
count++;
}
printf("%d integers read，the total = %d\n", count, total);
return 0;
}
stdin
12 23 34 45 56
^D//indicate a keyboard input Ctrl-D in linux or Ctrl-Z in windows
stdout
5 integers read，the total = 170
