#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstdio>
#include <string>
#include <cstring>
using namespace std;
int main()
{
	int n;
	char lastsign;
	char s[30];
	char s2[30];
	int a, b;
	cin >> n;
	getchar();
	getchar();
	int sum;
	while (n-- > 0) {
		fgets(s, sizeof(s), stdin);
		if (s[0] == 'a' || s[0] == 'b' || s[0] == 'c') {
			lastsign = s[0]; s[0] = ' ';//为了使下面的scanf能够正常输入;
		}
		sscanf(s, "%d %d", &a, &b);
		switch (lastsign) {
		case 'a': 
			sum = a + b; 
			sprintf(s2, "%d+%d=%d",a,b, sum); break;//break别忘了
		case 'b':
			sum = a - b; 
			sprintf(s2, "%d-%d=%d", a, b, sum); break;
		case 'c': 
			sum = a * b;
			sprintf(s2, "%d*%d=%d", a, b, sum); break;
		}
		printf("%s\n", s2);
		cout << strlen(s2) << endl;

	}
	return 0;
}

好像真的没什么问题啊 要疯了