跪求高手解决VC++编译通过，生成失败的问题，谢谢！
小弟在做《C语言的科学和艺术》的add2实例碰到如题问题：
编译能通过，但是生成失败，提示如下：
1>------ 已启动生成: 项目: add2, 配置: Debug Win32 ------
1>生成启动时间为 2012/12/14 21:17:20。
1>InitializeBuildStatus:
1> 正在对“Debug\add2.unsuccessfulbuild”执行 Touch 任务。
1>ClCompile:
1> 所有输出均为最新。
1>ManifestResourceCompile:
1> 所有输出均为最新。
1>add2.obj : error LNK2019: 无法解析的外部符号 _GetInteger，该符号在函数 _main 中被引用
1>C:\Users\Peter\Documents\Visual Studio 2010\Projects\app2\Debug\add2.exe : fatal error LNK1120: 1 个无法解析的外部命令
1>
1>生成失败。
1>
1>已用时间 00:00:00.45
========== 生成: 成功 0 个，失败 1 个，最新 0 个，跳过 0 个 ==========

以下为程序代码：
/*
* File: add2.c
* ------------
* This program reads in two numbers, adds them together,
* and prints their sum.
*/

#include <stdio.h>
#include "genlib.h"
#include "simpio.h"

main()
{
int n1, n2, total;
printf("This program adds two numbers.\n");
printf("1st number? ");
n1 = GetInteger();
printf("2nd number? ");
n2 = GetInteger();
total = n1 + n2;
printf("The total is %d.\n", total);
}

以下为库文件simpio.c代码：
/*
* File: simpio.c
* Version: 1.0
* Last modified on Fri Jul 15 14:10:41 1994 by eroberts
* -----------------------------------------------------
* This file implements the simpio.h interface.
*/

#include <stdio.h>
#include <string.h>

#include "genlib.h"
#include "strlib.h"
#include "simpio.h"

/*
* Constants:
* ----------
* InitialBufferSize -- Initial buffer size for ReadLine
*/

#define InitialBufferSize 120

/* Exported entries */

/*
* Functions: GetInteger, GetLong, GetReal
* ---------------------------------------
* These functions first read a line and then call sscanf to
* translate the number. Reading an entire line is essential to
* good error recovery, because the characters after the point of
* error would otherwise remain in the input buffer and confuse
* subsequent input operations. The sscanf line allows white space
* before and after the number but no other extraneous characters.
*/

int GetInteger(void)
{
string line;
int value;
char termch;

while (TRUE) {
line = GetLine();
switch (sscanf(line, " %d %c", &value, &termch)) {

case 1:
FreeBlock(line);
return (value);
case 2:
printf("Unexpected character: '%c'\n", termch);
break;
default:
printf("Please enter an integer\n");
break;
}
FreeBlock(line);
printf("Retry: ");
}
}

long GetLong(void)
{
string line;
long value;
char termch;

while (TRUE) {
line = GetLine();
switch (sscanf(line, " %ld %c", &value, &termch)) {
case 1:
FreeBlock(line);
return (value);
case 2:
printf("Unexpected character: '%c'\n", termch);
break;
default:
printf("Please enter an integer\n");
break;
}
FreeBlock(line);
printf("Retry: ");
}
}

double GetReal(void)
{
string line;
double value;
char termch;

while (TRUE) {
line = GetLine();
switch (sscanf(line, " %lf %c", &value, &termch)) {
case 1:
FreeBlock(line);
return (value);
case 2:
printf("Unexpected character: '%c'\n", termch);
break;
default:
printf("Please enter a real number\n");
break;
}

FreeBlock(line);
printf("Retry: ");
}
}

/*
* Function: GetLine
* -----------------
* This function is a simple wrapper; all the work is done by
* ReadLine.
*/

string GetLine(void)
{
return (ReadLine(stdin));
}

/*
* Function: ReadLine
* ------------------
* This function operates by reading characters from the file
* into a dynamically allocated buffer. If the buffer becomes
* full before the end of the line is reached, a new buffer
* twice the size of the previous one is allocated.
*/

string ReadLine(FILE *infile)
{
string line, nline;
int n, ch, size;

n = 0;
size = InitialBufferSize;
line = GetBlock(size + 1);
while ((ch = getc(infile)) != '\n' && ch != EOF) {
if (n == size) {
size *= 2;
nline = (string) GetBlock(size + 1);
strncpy(nline, line, n);
FreeBlock(line);
line = nline;
}
line[n++] = ch;
}
if (n == 0 && ch == EOF) {
FreeBlock(line);
return (NULL);
}
line[n] = '\0';
nline = (string) GetBlock(n + 1);
strcpy(nline, line);
FreeBlock(line);
return (nline);
}

[解决办法]
把simpio.c添加到工程
[解决办法]
添加simpio.c到你的工程里面。