Misc/abrash-black-book
Watch
1
0
Fork
You've already forked abrash-black-book
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Use backtick code blocks for syntax highlighting

Browse source
This commit is contained in:
James Gregory 2013-12-31 11:38:48 +11:00
commit f658bfbb40
203 changed files with 26546 additions and 25801 deletions
Download patch file Download diff file Expand all files Collapse all files

100
10-02.md
View file

@ -64,28 +64,30 @@ default optimization was used. All times measured with the Zen timer
**LISTING 10.1 L10-1.C**
/* Finds and returns the greatest common divisor of two positive
integers. Works by trying every integral divisor between the
smaller of the two integers and 1, until a divisor that divides
both integers evenly is found. All C code tested with Microsoft
and Borland compilers.*/
```c
/* Finds and returns the greatest common divisor of two positive
integers. Works by trying every integral divisor between the
smaller of the two integers and 1, until a divisor that divides
both integers evenly is found. All C code tested with Microsoft
and Borland compilers.*/
unsigned int gcd(unsigned int int1, unsigned int int2) {
unsigned int temp, trial_divisor;
/* Swap if necessary to make sure that int1 >= int2 */
if (int1 < int2) {
temp = int1;
int1 = int2;
int2 = temp;
}
/* Now just try every divisor from int2 on down, until a common
divisor is found. This can never be an infinite loop because
1 divides everything evenly */
for (trial_divisor = int2; ((int1 % trial_divisor) != 0) ||
((int2 % trial_divisor) != 0); trial_divisor—)
;
return(trial_divisor);
}
unsigned int gcd(unsigned int int1, unsigned int int2) {
unsigned int temp, trial_divisor;
/* Swap if necessary to make sure that int1 >= int2 */
if (int1 < int2) {
temp = int1;
int1 = int2;
int2 = temp;
}
/* Now just try every divisor from int2 on down, until a common
divisor is found. This can never be an infinite loop because
1 divides everything evenly */
for (trial_divisor = int2; ((int1 % trial_divisor) != 0) ||
((int2 % trial_divisor) != 0); trial_divisor—)
;
return(trial_divisor);
}
```
#### Wasted Breakthroughs {#Heading5}
@ -99,32 +101,34 @@ in Listing 10.2.
**LISTING 10.2 L10-2.C**
/* Finds and returns the greatest common divisor of two positive
integers. Works by subtracting the smaller integer from the
larger integer until either the values match (in which case
that's the gcd), or the larger integer becomes the smaller of
the two, in which case the two integers swap roles and the
subtraction process continues. */
```c
/* Finds and returns the greatest common divisor of two positive
integers. Works by subtracting the smaller integer from the
larger integer until either the values match (in which case
that's the gcd), or the larger integer becomes the smaller of
the two, in which case the two integers swap roles and the
subtraction process continues. */
unsigned int gcd(unsigned int int1, unsigned int int2) {
unsigned int temp;
/* If the two integers are the same, that's the gcd and we're
done */
if (int1 == int2) {
return(int1);
}
/* Swap if necessary to make sure that int1 >= int2 */
if (int1 < int2) {
temp = int1;
int1 = int2;
int2 = temp;
}
unsigned int gcd(unsigned int int1, unsigned int int2) {
unsigned int temp;
/* If the two integers are the same, that's the gcd and we're
done */
if (int1 == int2) {
return(int1);
}
/* Swap if necessary to make sure that int1 >= int2 */
if (int1 < int2) {
temp = int1;
int1 = int2;
int2 = temp;
}
/* Subtract int2 from int1 until int1 is no longer the larger of
the two */
do {
int1 -= int2;
} while (int1 > int2);
/* Now recursively call this function to continue the process */
return(gcd(int1, int2));
}
/* Subtract int2 from int1 until int1 is no longer the larger of
the two */
do {
int1 -= int2;
} while (int1 > int2);
/* Now recursively call this function to continue the process */
return(gcd(int1, int2));
}
```