undefined reference to error解决方法

Posted 2023-04-28

#include<stdio.h>
typedef struct
char Data[100];
int top;
Stack;
int compare(char a, char b);
void Push1(Stack *s, char element);
char Pop1(Stack *s);

int main()
int i = 0, j = 0;
char expression[20], exp2[20], popChar;
Stack stack, *Ptr = &stack;
stack.top = -1;
printf("input the expression:");
scanf("%s", expression);
while(expression[i] != '\0')
if(expression[i] == ' '|| expression[i] =='\t')
i++;
continue;
else if(expression[i] == 0||expression[i] == 1||expression[i] == 2||expression[i] == 3||expression[i] == 4
||expression[i] == 5||expression[i] == 6||expression[i] == 7||expression[i] == 8||expression[i] == 9
||expression[i] == 10)
printf("%c", expression[i]);
else if(expression[i] == '(')
push1(Ptr, expression[i]);
else if(expression[i]==')')
while(1)
popChar = pop1(Ptr);
if(popChar != '(')
printf("%c", popChar);
else
break;

else if(expression[i] == '+'||expression[i] == '-'||expression[i] == '*'||expression[i] == '/')
if(compare(expression[i], Ptr->Data[Ptr->top]))
push1(Ptr, expression[i]);
else
printf("%c", pop1(Ptr));
while(compare(Ptr->Data[Ptr->top], expression[i]))
printf("%c", pop1(Ptr));
push1(Ptr, expression[i]);



i++;

while(Ptr->top != -1)
printf("%c", pop1(Ptr));

return 0;


void Push1(Stack *s, char element)
if(s->top == 100 - 1)
printf("full");
return;

else
s->Data[++(s->top)] = element;



char Pop1(Stack *s)
return s->Data[(s->top)--];


int compare(char a, char b)
if((a == '*'||a == '/') && (b == '+'||b == '-'))
return 1;
else
return 0;



这两个函数都是在同一个文件中定义的，为什么说没定义。百度了一下，看不懂，

我用的devc++，MINGW GCC 4.8.1 ，

参考技术A void Push1(Stack *s, char element);
char Pop1(Stack *s);
您定义的函数首字符都是大写的。而调用里面的写成了push1和pop1，小写的了。本回答被提问者和网友采纳 参考技术B 你的代码函数首字母是大写的,而错误的这些都是首字母小写的...
void Push1(Stack *s, char element);--声明
push1(Ptr, expression[i]);-----引用,

undefined reference to symbol '_ZNK11GenICam_3_016GenericException17GetSourceFileNameEv'(示例代

今天在编译DALSA二次开发的源码时，出现了如下错误：

/usr/bin/ld: ./out/camera.o: undefined reference to symbol ‘_ZNK11GenICam_3_016GenericException17GetSourceFileNameEv‘
//opt/genicam_v3_0/bin/Linux64_x64/libGCBase_gcc421_v3_0.so: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
需要的库都（libGevApi）添加到makefile中去了，结果还是有这个错误出现。

经添加库 libGCBase_gcc421_v3_0.so 问题解决。

makefile中添加信息如下：

ifndef ARCH

ARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/x86_64/x86_64/)

endif

ifeq ($(ARCH), x86_64)

    ARCHNAME=x86_64

    ARCH_GENICAM_BIN=Linux64_x64

    ARCH_OPTIONS= -Dx86_64 -D_REENTRANT

    ARCH_GCCVER=421

else

    ARCHNAME=i386

    ARCH_GENICAM_BIN=Linux32_i86

    ARCH_OPTIONS= -D__i386__ -D_REENTRANT

    ARCH_GCCVER=421

endif

#

# Arch dependent GenICam library specification

#

GENICAM_ROOT_V3_0=/opt/genicam_v3_0

GENICAM_PATH_VERSION=v3_0

GENICAM_PATH:=$(GENICAM_ROOT_V3_0)

GENICAM_LIBS=-L$(GENICAM_PATH)/bin/$(ARCH_GENICAM_BIN)

                    -lGenApi_gcc$(ARCH_GCCVER)_$(GENICAM_PATH_VERSION)

                    -lGCBase_gcc$(ARCH_GCCVER)_$(GENICAM_PATH_VERSION)

LDLIBS += $(GENICAM_LIBS)

INCLUDE += -I$(GENICAM_PATH)/bin/$(ARCH_GENICAM_BIN)