实验：(++i)+(++i)+(++i) 与 (i++)+(i++)+(i++)

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1.实验目标：通过实验得出影响(++i)+(++i)+(++i)与(i++)+(i++)+(i++)计算结果的主要因素

2.实验方法：在两套不同的硬件平台 ( Inter平台和AMD平台 ) 上测试3种编译器 (VC++6.0 TURBO C 2.0 JAVA 2 Platform JDK) 的运算结果

第一部分： AMD平台下的测试

代码一：

#include <stdio.h>

void main()

{

int i = 3,sum;

sum = (++i)+(++i)+(++i);

printf("i = %d , sum = %d /n",i,sum);

}

实验环境1： AMD Athlon64 2800+ (754Pin)

Windows Vista Ultimate (32bit)

Virsual C++ 6.0 Enterprise (SP6)

运行结果: i = 6 , sum = 16

Disassembly Code:

0040107F mov eax,dword ptr [ebp-4]

00401082 add eax,1

00401085 mov dword ptr [ebp-4],eax

00401088 mov ecx,dword ptr [ebp-4]

0040108B add ecx,1

0040108E mov dword ptr [ebp-4],ecx

00401091 mov edx,dword ptr [ebp-4]

00401094 add edx,dword ptr [ebp-4]

00401097 mov eax,dword ptr [ebp-4]

0040109A add eax,1

0040109D mov dword ptr [ebp-4],eax

004010A0 add edx,dword ptr [ebp-4]

004010A3 mov dword ptr [ebp-8],edx

实验环境2： AMD Athlon64 2800+ (754Pin)

Windows Vista Ultimate (32bit)

Borland Turbo C 2.0

运行结果: i = 6 , sum = 18

实验环境3： AMD Athlon64 2800+ (754Pin)

Windows Vista Ultimate (32bit)

JAVA Development Kit 1.6.0_03

JAVA类似代码:

public class Test

{

public static void main(String[] args)

{

int i = 3,sum;

sum = (++i)+(++i)+(++i);

System.out.println("i = "+i+" , sum = "+sum);

}

运行结果: i = 6 , sum = 15

代码二：

#include <stdio.h>

void main()

{

int i = 3,sum;

sum = (i++)+(i++)+(i++);

printf("i = %d , sum = %d /n",i,sum);

}

实验环境1： AMD Athlon64 2800+ (754Pin)

Windows Vista Ultimate (32bit)

Virsual C++ 6.0 Enterprise (SP6)

运行结果: i = 6 , sum = 9

Disassembly Code:

0040107F mov eax,dword ptr [ebp-4]

00401082 add eax,dword ptr [ebp-4]

00401085 add eax,dword ptr [ebp-4]

00401088 mov dword ptr [ebp-8],eax

0040108B mov ecx,dword ptr [ebp-4]

0040108E add ecx,1

00401091 mov dword ptr [ebp-4],ecx

00401094 mov edx,dword ptr [ebp-4]

00401097 add edx,1

0040109A mov dword ptr [ebp-4],edx

0040109D mov eax,dword ptr [ebp-4]

004010A0 add eax,1

004010A3 mov dword ptr [ebp-4],eax

实验环境2： AMD Athlon64 2800+ (754Pin)

Windows Vista Ultimate (32bit)

Borland Turbo C 2.0

运行结果: i = 6 , sum = 9

实验环境3： AMD Athlon64 2800+ (754Pin)

Windows Vista Ultimate (32bit)

JAVA Development Kit 1.6.0_03

JAVA类似代码:

public class Test

{

public static void main(String[] args)

{

int i = 3,sum;

sum = (i++)+(i++)+(i++);

System.out.println("i = "+i+" , sum = "+sum);

}

运行结果: i = 6 , sum = 12

第二部分： Intel平台下的测试

代码一：

#include <stdio.h>

void main()

{

int i = 3,sum;

sum = (++i)+(++i)+(++i);

printf("i = %d , sum = %d /n",i,sum);

}

实验环境1： Inter Celeron 331(2.66Hz,LGA775,90nm)

Windows Server 2003 Enterprise Edition (32bit)

Virsual C++ 6.0 Enterprise (SP6)

运行结果: i = 6 , sum = 16

Disassembly Code:

0040102F mov eax,dword ptr [ebp-4]

00401032 add eax,1

00401035 mov dword ptr [ebp-4],eax

00401038 mov ecx,dword ptr [ebp-4]

0040103B add ecx,1

0040103E mov dword ptr [ebp-4],ecx

00401041 mov edx,dword ptr [ebp-4]

00401044 add edx,dword ptr [ebp-4]

00401047 mov eax,dword ptr [ebp-4]

0040104A add eax,1

0040104D mov dword ptr [ebp-4],eax

00401050 add edx,dword ptr [ebp-4]

00401053 mov dword ptr [ebp-8],edx

实验环境2： Inter Celeron 331(2.66Hz,LGA775,90nm)

Windows Server 2003 Enterprise Edition (32bit)

Borland Turbo C 2.0

运行结果: i = 6 , sum = 18

实验环境3： Inter Celeron 331(2.66Hz,LGA775,90nm)

Windows Server 2003 Enterprise Edition (32bit)

JAVA Development Kit 1.6.0_03

JAVA类似代码:

public class Test

{

public static void main(String[] args)

{

int i = 3,sum;

sum = (++i)+(++i)+(++i);

System.out.println("i = "+i+" , sum = "+sum);

}

运行结果: i = 6 , sum = 15

代码二：

#include <stdio.h>

void main()

{

int i = 3,sum;

sum = (i++)+(i++)+(i++);

printf("i = %d , sum = %d /n",i,sum);

}

实验环境1： Inter Celeron 331(2.66Hz,LGA775,90nm)

Windows Server 2003 Enterprise Edition (32bit)

Virsual C++ 6.0 Enterprise (SP6)

运行结果: i = 6 , sum = 9

Disassembly Code:

0040102F mov eax,dword ptr [ebp-4]

00401032 add eax,dword ptr [ebp-4]

00401035 add eax,dword ptr [ebp-4]

00401038 mov dword ptr [ebp-8],eax

0040103B mov ecx,dword ptr [ebp-4]

0040103E add ecx,1

00401041 mov dword ptr [ebp-4],ecx

00401044 mov edx,dword ptr [ebp-4]

00401047 add edx,1

0040104A mov dword ptr [ebp-4],edx

0040104D mov eax,dword ptr [ebp-4]

00401050 add eax,1

00401053 mov dword ptr [ebp-4],eax

实验环境2： Inter Celeron 331(2.66Hz,LGA775,90nm)

Windows Server 2003 Enterprise Edition (32bit)

Borland Turbo C 2.0

运行结果: i = 6 , sum = 9

实验环境3：Inter Celeron 331(2.66Hz,LGA775,90nm)

Windows Server 2003 Enterprise Edition (32bit)

JAVA Development Kit 1.5.0_04

JAVA类似代码:

public class Test

{

public static void main(String[] args)

{

int i = 3,sum;

sum = (i++)+(i++)+(i++);

System.out.println("i = "+i+" , sum = "+sum);

}

运行结果: i = 6 , sum = 12