Clock timer usage and Random Number Generation

Clock is used for timing, accurate to the MS level

Clock () in the <ctime> header file, the returned value is clock_t, which is an oversized integer. The following is an example of the Computer cycle time.

# Include <iostream>
# Include <string>
# Include <ctime>
Using namespace STD;
Int main (){
 
Clock_t start, finsh;

Start = clock ();
For (INT I = 0; I <9000; ++ I ){
For (Int J = 0; j <9000; ++ J ){

}
}
Finsh = clock ();

Cout <finsh-start <"Ms" <Endl; // In addition to 1000, cout is changed to S (seconds)

Return 0;
}

 

Generate random numbers:

# Include <iostream>
# Include <cstdlib>
# Include <string>
# Include <ctime>
Using namespace STD;
Int main (){
Srand (unsigned (Time (null); // use time as the seed
Int;
For (INT I = 0; I <10; ++ I ){
A = rand () % 100;
Cout <A <Endl;
}
System ("pause ");
Return 0;
}