Show 例子

请尝试以下示例以了解C ++中可用的所有关系运算符。

将以下C ++程序复制并粘贴到test.cpp文件中，然后编译并运行该程序。

#include <iostream>
using namespace std;
main() {
   int a = 21;
   int b = 10;
   int c ;
   if( a == b ) {
      cout << "Line 1 - a is equal to b" << endl ;
   } else {
      cout << "Line 1 - a is not equal to b" << endl ;
   }
   if( a < b ) {
      cout << "Line 2 - a is less than b" << endl ;
   } else {
      cout << "Line 2 - a is not less than b" << endl ;
   }
   if( a > b ) {
      cout << "Line 3 - a is greater than b" << endl ;
   } else {
      cout << "Line 3 - a is not greater than b" << endl ;
   }
   /* Let's change the values of a and b */
   a = 5;
   b = 20;
   if( a <= b ) {
      cout << "Line 4 - a is either less than\or equal to  b" << endl ;
   }
   if( b >= a ) {
      cout << "Line 5 - b is either greater than\or equal to b" << endl ;
   }
   return 0;
}

编译并执行上述代码时，会产生以下结果 -

Line 1 - a is not equal to b
Line 2 - a is not less than b
Line 3 - a is greater than b
Line 4 - a is either less than or euqal to  b
Line 5 - b is either greater than or equal to b