质数求和，为什么加不上2，哭死(关键词-input)

Question

#include<stdio.h>
int main(void){
//User input an integer
//program only add prime number together
//output the sum of all prime number user inputted
//if no prime, output 0
//input -1 for exit

    int sum, enterNumber, number;
    number = 2;
    sum = 0;
    printf("Enter digit dayu 0(enter -1 end the program): ");
    scanf("%d", &enterNumber);
    if(enterNumber == -1){
            return 0;
    }
    while(enterNumber != -1){
            scanf("%d", &enterNumber);
            if(enterNumber == -1){
                    break;
            }
            if(enterNumber < number){
                    printf("The sum is 0\n");
            } else {
                    while(enterNumber >= number){
                          if(enterNumber % number == 0){
                          break;
                          } else {
                               number = number + 1;
                          }
                    }
                    if(number == enterNumber){
                            sum = sum + enterNumber;
                    } else {
                            printf("The sum is 0\n");
                    }
           }
    }
    printf("The sum is %d\n", sum);
    return 0;

}

Answer 1

修改如下，供参考：

#include<stdio.h>
int main(void){
//User input an integer
//program only add prime number together
//output the sum of all prime number user inputted
//if no prime, output 0
//input -1 for exit

    int sum, enterNumber, number ,k;
                 //number = 2;
                 //sum = 0;
    printf("Enter digit dayu 0(enter -1 end the program): ");
                 //scanf("%d", &enterNumber);
                 //if(enterNumber == -1){
                 //        return 0;
                 //}
    while (1){   //(enterNumber != -1)
        scanf("%d", &enterNumber);
        if(enterNumber == -1){
            break;
        }
        for (number = 2 ,sum = 0;enterNumber >= number; number++) //if(enterNumber < number)
        {
                                  //printf("The sum is 0\n");
                                  //}
            k = 2;                //else {
            while(number > k){
                 if(number % k == 0){
                     break;
                 }
                 k++;            //else {
                                 //number = number + 1;
                                 //}
            }
            if(number == k){
                sum = sum + number;
            }
                                //else {
                                //    printf("The sum is 0\n");
                                 //}
        }
        printf("The sum is %d\n", sum);
    }
    return 0;
}