abs ()函数

 abs
语法:

 
  #include <stdlib.h>
  int abs( int num );
 

功能： 函数返回参数num.的绝对值。例如:

    int magic_number = 10;
    cout << "Enter a guess: ";
    cin >> x;
    cout << "Your guess was " << abs( magic_number - x ) << " away from the magic number." << endl;
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