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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. int sum = 0;
  5. while (1) {
  6. int num = -1;
  7. scanf("%d", &num);
  8. if (num >= 0) sum += num;
  9. else break;
  10. }
  11. }
  12.  
  13. //https://pt.stackoverflow.com/q/167698/101
Success #stdin #stdout 0s 4156KB
stdin
1
2
3

stdout
Standard output is empty