Содержание
- 1 Create Random number
- 2 math library functions: log10, fabs, ceil, floor
- 3 math library functions: pow, fmod, sin, cos, tan
- 4 Raise x to the y power
- 5 Use math function: cos, sin, tan
- 6 Use math function: sqrt, pow, log
- 7 Use the abs() function
Create Random number
#include <iostream>
#include <cstdlib>
using namespace std;
int main()
{
int magic;
int guess;
magic = rand(); // get a random number
cout << "Enter your guess: ";
cin >> guess;
if(guess == magic)
cout << "Right";
return 0;
}Enter your guess: 2
math library functions: log10, fabs, ceil, floor
#include <iostream>
using std::cout;
using std::endl;
using std::fixed;
#include <iomanip>
using std::setprecision;
#include <cmath>
using namespace std;
int main()
{
cout << fixed << setprecision( 1 );
cout << "\nlog10(" << 1.0 << ") = " << log10( 1.0 )<< "\nlog10(" << 10.0 <<) = " << log10( 10.0 )
<< "\nlog10(" << 100.0 << ") = " << log10( 100.0 ) ;
cout << "\nfabs(" << 13.5 << ") = " << fabs( 13.5 )<< "\nfabs(" << 0.0 << ") = " << fabs( 0.0 )
<< "\nfabs(" << -13.5 << ") = " << fabs( -13.5 );
cout << "\nceil(" << 9.2 << ") = " << ceil( 9.2 )<< "\nceil(" << -9.8 << ")= " << ceil( -9.8 );
cout << "\nfloor(" << 9.2 << ") = " << floor( 9.2 )<< "\nfloor(" << -9.8 <<) = " << floor( -9.8 );
return 0;
}log10(1.0) = 0.0
log10(10.0) = 1.0
log10(100.0) = 2.0
fabs(13.5) = 13.5
fabs(0.0) = 0.0
fabs(-13.5) = 13.5
ceil(9.2) = 10.0
ceil(-9.8) = -9.0
floor(9.2) = 9.0
floor(-9.8) = -10.0
math library functions: pow, fmod, sin, cos, tan
#include <iostream>
using std::cout;
using std::endl;
using std::fixed;
#include <iomanip>
using std::setprecision;
#include <cmath>
using namespace std;
int main()
{
cout << fixed << setprecision( 1 );
cout << "\npow(" << 2.0 << ", " << 7.0 << ") = " << pow( 2.0, 7.0 ) << "\npow(" << 9.0 << ", "
<< 0.5 << ") = " << pow( 9.0, 0.5 );
cout << setprecision(3) << "\nfmod("<< 13.675 << ", " << 2.333 << ") = " << fmod( 13.675, 2.333 ) << setprecision( 1 );
cout << "\nsin(" << 0.0 << ") = " << sin( 0.0 );
cout << "\ncos(" << 0.0 << ") = " << cos( 0.0 );
cout << "\ntan(" << 0.0 << ") = " << tan( 0.0 ) << endl;
return 0;
}pow(2.0, 7.0) = 128.0
pow(9.0, 0.5) = 3.0
fmod(13.675, 2.333) = 2.010
sin(0.0) = 0.0
cos(0.0) = 1.0
tan(0.0) = 0.0
Raise x to the y power
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
int main()
{
int base;
int exponent;
int i;
int power;
i = 1;
power = 1;
cout << "Enter base as an integer: ";
cin >> base;
cout << "Enter exponent as an integer: ";
cin >> exponent;
while ( i <= exponent )
{
power *= base;
i++;
}
cout << power << endl;
return 0;
}Enter base as an integer: Joe
Enter exponent as an integer: 64
Use math function: cos, sin, tan
#include <cmath>
#include <iostream>
using namespace std;
int main()
{
double angle, dsine,dcos,dtan;
cout << "Please enter an angle in radians \n";
cin >> angle;
dcos =cos(angle);
dsine =sin(angle);
dtan =tan(angle);
cout << " Your angles trigonometric functions are \n";
cout << " Sine is " << dsine << "\n";
cout << " Cosine is " << dcos << "\n";
cout << " Tangent is " << dtan << "\n";
return 0;
}Please enter an angle in radians
12
Your angles trigonometric functions are
Sine is -0.536573
Cosine is 0.843854
Tangent is -0.63586
Use math function: sqrt, pow, log
#include <cmath>
#include <iostream>
using namespace std;
int main()
{
double number, dsqrt,dpow,dlog;
cout << "Please enter a number \n";
cin >> number;
dsqrt =sqrt(number);
dpow =pow(number,5);
dlog =log(number);
cout << " Math Example\n";
cout << " Square Root is " << dsqrt << "\n";
cout << " Raised to the fifth power is " << dpow << "\n";
cout << " Log is " << dlog << "\n";
return 0;
}Please enter a number
12
Math Example
Square Root is 3.4641
Raised to the fifth power is 248832
Log is 2.48491
Use the abs() function
#include <iostream>
#include <cstdlib>
using namespace std;
int main()
{
int result;
result = abs(-10);
cout << result;
return 0;
}10"
