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解题思路:

注意事项:

参考代码:

#include<stdio.h>

#include<stdlib.h>

int main()

{

    int a, b, count;

    char symbol1, symbol2, c[3];

    count = 0;

    while(scanf("%d%c%d%c%s", &a, &symbol1, &b, &symbol2, c) != EOF)

    {

        if(c[0] == '?')

        {

            continue;

        }

        switch(symbol1)

        {

            case '+':if(a + b == atoi(c)){

                count++;

            };break;

            case '-':if(a - b == atoi(c)){

                count++;

            };break;

        }

    }

    printf("%d", count);

    return 0;

}