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C++提供了六個關(guān)系運算符來比較數(shù)字。
運算符 | 含義 |
---|---|
< | 小于 |
<= | 小于或等于 |
== | 等于 |
> | 大于 |
>= | 大于或等于 |
!= | 不等于 |
#include <iostream>
#include <string> // string class
int main()
{
using namespace std;
string word = "?ate";
for (char ch = "a"; word != "mate"; ch++)
{
cout << word << endl;
word[0] = ch;
}
cout << "After loop ends, word is " << word << endl;
// cin.get();
return 0;
}
上面的代碼生成以下結(jié)果。
使用if語句,關(guān)系運算符和等式運算符比較整數(shù)。
#include <iostream> // allows program to perform input and output
using std::cout; // program uses cout
using std::cin; // program uses cin
using std::endl; // program uses endl
int main() {
int number1; // first integer to compare
int number2; // second integer to compare
cout << "Enter two integers to compare: "; // prompt user for data
cin >> number1 >> number2; // read two integers from user
if ( number1 == number2 )
cout << number1 << " == " << number2 << endl;
if ( number1 != number2 )
cout << number1 << " != " << number2 << endl;
if ( number1 < number2 )
cout << number1 << " < " << number2 << endl;
if ( number1 > number2 )
cout << number1 << " > " << number2 << endl;
if ( number1 <= number2 )
cout << number1 << " <= " << number2 << endl;
if ( number1 >= number2 )
cout << number1 << " >= " << number2 << endl;
}
上面的代碼生成以下結(jié)果。
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