自测和数据一样，为什么爆0

#include <bits/stdc++.h>
using namespace std;
template <class T>
inline void read(T &x){
    char c=getchar();x=0;bool f=0;
    while(!isdigit(c))f^=!(c^45),c=getchar();
    while(isdigit(c))x=(x<<1)+(x<<3)+(c^48),c=getchar();
    if(f)x=-x;
}
char s[101], ans[101];
int n, x, y;
char op;
int main(){
    read(n);
    for(int i = 1; i <= n; i++) {
        gets(s);
        if(s[0] >= 'a' && s[0] <= 'z') {
            sscanf(s, "%c%d%d", &op, &x, &y);
        }
        else if(s[0] >= '0' && s[0] <= '9'){
            sscanf(s, "%d%d", &x, &y);
        }
        memset(ans, 0, sizeof(ans));
        if(op == 'a') sprintf(ans, "%d+%d=%d", x, y, x + y);
        else if(op == 'b') sprintf(ans, "%d-%d=%d", x, y, x - y);
        else if(op == 'c') sprintf(ans, "%d*%d=%d", x, y, x * y);
        cout << ans << "\n" << strlen(ans) << "\n";
    }
    return 0;
}

显示 Too short on line 1.