PAT Basic Level 1011. A+B和C（15）

【来源】

1011. A+B和C（15）

【分析】

本题看似简单，需要注意数据的范围为[-2³¹, 2³¹]，int类型有可能导致溢出。long long int为64位整数，满足题目要求。

【源码】

#include <iostream>using namespace std;int main(){    int n;    cin >> n;    for (int i = 0; i < n; ++i){        long long a, b, c;        cin >> a >> b >> c;        cout << "Case #" << i + 1 << ": ";                if (a + b > c){            cout << "true\n";        }        else{            cout << "false\n";        }    }    return 0;}

【扩展】

 关于C++中各个数据类型所占的空间大小以及所能表示的数的范围如下图：

生成以上数据的代码（参考了某位大牛的代码）：

#include<iostream>#include<string>#include <limits>using namespace std;int main(){    cout << "bool: \t\t" << "Bytes：" << sizeof(bool);    cout << "\tMAX：" << (numeric_limits<bool>::max)();    cout << "\t\tMIN：" << (numeric_limits<bool>::min)() << endl;    cout << "char: \t\t" << "Bytes：" << sizeof(char);    cout << "\tMAX：" << (numeric_limits<char>::max)();    cout << "\t\tMIN：" << (numeric_limits<char>::min)() << endl;    cout << "signed char: \t" << "Bytes：" << sizeof(signed char);    cout << "\tMAX：" << (numeric_limits<signed char>::max)();    cout << "\t\tMIN：" << (numeric_limits<signed char>::min)() << endl;    cout << "unsigned char: \t" << "Bytes：" << sizeof(unsigned char);    cout << "\tMAX：" << (numeric_limits<unsigned char>::max)();    cout << "\t\tMIN：" << (numeric_limits<unsigned char>::min)() << endl;    cout << "wchar_t: \t" << "Bytes：" << sizeof(wchar_t);    cout << "\tMAX：" << (numeric_limits<wchar_t>::max)();    cout << "\t\tMIN：" << (numeric_limits<wchar_t>::min)() << endl;    cout << "short: \t\t" << "Bytes：" << sizeof(short);    cout << "\tMAX：" << (numeric_limits<short>::max)();    cout << "\t\tMIN：" << (numeric_limits<short>::min)() << endl;    cout << "int: \t\t" << "Bytes：" << sizeof(int);    cout << "\tMAX：" << (numeric_limits<int>::max)();    cout << "\tMIN：" << (numeric_limits<int>::min)() << endl;    cout << "unsigned: \t" << "Bytes：" << sizeof(unsigned);    cout << "\tMAX：" << (numeric_limits<unsigned>::max)();    cout << "\tMIN：" << (numeric_limits<unsigned>::min)() << endl;    cout << "long: \t\t" << "Bytes：" << sizeof(long);    cout << "\tMAX：" << (numeric_limits<long>::max)();    cout << "\tMIN：" << (numeric_limits<long>::min)() << endl;    cout << "unsigned long: \t" << "Bytes：" << sizeof(unsigned long);    cout << "\tMAX：" << (numeric_limits<unsigned long>::max)();    cout << "\tMIN：" << (numeric_limits<unsigned long>::min)() << endl;    cout << "long long: \t" << "Bytes：" << sizeof(long long);    cout << "\tMAX：" << (numeric_limits<long long>::max)();    cout << "\tMIN：" << (numeric_limits<long long>::min)() << endl;    cout << "double: \t" << "Bytes：" << sizeof(double);    cout << "\tMAX：" << (numeric_limits<double>::max)();    cout << "\tMIN：" << (numeric_limits<double>::min)() << endl;    cout << "long double: \t" << "Bytes：" << sizeof(long double);    cout << "\tMAX：" << (numeric_limits<long double>::max)();    cout << "\tMIN：" << (numeric_limits<long double>::min)() << endl;    cout << "float: \t\t" << "Bytes：" << sizeof(float);    cout << "\tMAX：" << (numeric_limits<float>::max)();    cout << "\tMIN：" << (numeric_limits<float>::min)() << endl;    cout << "size_t: \t" << "Bytes：" << sizeof(size_t);    cout << "\tMAX：" << (numeric_limits<size_t>::max)();    cout << "\tMIN：" << (numeric_limits<size_t>::min)() << endl;    cout << "string: \t" << "Bytes：" << sizeof(string) << endl;    system("pause");    return 0;}