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c语言例及教程c语言案例 ( cases of C language and tutorial c language case ).doc
c语言100例及教程c语言案例 10(100 cases of C language and tutorial c language case 10)
==91--100:.: classic C program 100 cases:
Classic C program: 100 cases of ==91--100
[program 91]
Title: time function example 1
1. program analysis:
2. program source code:
#include stdio.h
#include time.h
Void main ()
{time_t lt; /*define a Longint time varible*/
Lt=time (NULL); /*system time and date*/
Printf (CTime ()); /*english format output*/
Printf (asctime (Localtime ())); /*tranfer to tm*/
Printf (asctime (gmtime ())); /*tranfer to Greenwich time*/
}
==============================================================
[program 92]
Title: time function example 2
1. program analysis:
2. program source code:
/*calculate time*/
#include time.h
#include stdio.h
(main)
{time_t start, end;
Int i;
Start=time (NULL);
For (i=0; i3000; i++)
{printf (\1\1\1\1\1\1\1\1\1\1\n);}
End=time (NULL);
Printf (\1: The different is%6.3f\n, difftime (end, start));
}
==============================================================
[program 93]
Title: time function example 3
1. program analysis:
2. program source code:
/*calculate time*/
#include time.h
#include stdio.h
(main)
{clock_t start, end;
Int i;
Double var;
Start=clock ();
For (i=0; i10000; i++)
{printf (\1\1\1\1\1\1\1\1\1\1\n);}
End=clock ();
Printf (\1: The different is%6.3f\n, (double) (end-start);
}
==============================================================
[program 94]
Title: time function example 4, a guessing game, judge a persons reaction speed. (moderators are beginners.)
1. program analysis:
2. program source code:
#include time.h
#include stdlib.h
#include stdio.h
(main)
{char c;
Clock_t start, end;
Time_t a, b;
Double var;
Int i, guess;
Srand (time (NULL));
Printf (do you want to play it. (yorn) \n);
Loop:
While ((c=getchar ()) ==y)
{
I=rand ()%100;
Printf (\nplease input number you guess:\n);
Start=clock ();
A=time (NULL);
Scanf (%d, guess);
While (guess! =i)
{if (guessi)
{printf (please input a little smaller.\n);
Scanf (%d, guess);}
Else
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