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#include <stdio.h>
int main()
{
int sum=0;
int input;
while(1){
printf("숫자를 입력하세요 (-1를 입력하면종료): ");
scanf("%d", &input);
if(input == -1 ) {
break;
}
sum += input;
}
printf("입력된 숫자의 합계는 %d 입니다.\n",sum);
return 0;
}
