#include <cstdio> #include <cstdlib> void allocateSpace(char* &p){ p = (char *)malloc(100); } int main() { char *p; allocateSpace(p); fgets(p,100,stdin); puts(p); free(p); return 0; }我在CLion中编译这段C++代码构建失败，出现以下问题====================[ 构建 | CStudy2 | Debug ]==================================== "E:\CLion 2024.3.4\bin\cmake\win\x64\bin\cmake.exe" --build E:\CLionProjects\CStudy2\cmake-build-debug --target CStudy2 -j 14 [1/1] Linking CXX executable CStudy2.exe FAILED: CStudy2.exe C:\Windows\system32\cmd.exe /C "cd . && "E:\CLion 2024.3.4\bin\mingw\bin\g++.exe" -g CMakeFiles/CStudy2.dir/main.cpp.obj CMakeFiles/CStudy2.dir/Test8/Test8_2.cpp.obj -o CStudy2.exe -Wl,--out-implib,libCStudy2.dll.a -Wl,--major-image-version,0,--minor-image-version,0 -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ." E:\CLion 2024.3.4\bin\mingw\bin/ld.exe: CMakeFiles/CStudy2.dir/Test8/Test8_2.cpp.obj: in function `main': E:/CLionProjects/CStudy2/Test8/Test8_2.cpp:13: multiple definition of `main'; CMakeFiles/CStudy2.dir/main.cpp.obj:E:/CLionProjects/CStudy2/main.cpp:5: first defined here collect2.exe: error: ld returned 1 exit status ninja: build stopped: subcommand failed.什么原因？怎么解决？

#include <cstdio> #include <cstdlib> void allocateSpace(char* &p){ p = (char )malloc(100); } int main() { char p; allocateSpace(p); fgets(p,100,stdin); puts(p); free(p); return 0; }这段代码输出结果会有回车，如何去除？

#include <cstdlib> #include <cstring> // 需要添加头文件 void allocateSpace(char* &p){ p = (char *)malloc(100); } int main() { char *p; allocateSpace(p); fgets(p, 100, stdin); // 去除换行符 ...

#include<cstdio> #include<cstdlib> #include<iostream> using namespace std; typedef struct Node { int data; Node lchild, rchild; }BiNode, *BiTree; BiTree Creat_Tree() { BiTree root=NULL; int data; int key; char flag; scanf("%d",&data); while(data!=flag) { BiTree pa,ptr,p; p=root; ptr=(BiTree)malloc(sizeof(BiNode)); ptr->data=key; ptr->lchild=NULL; ptr->rchild=NULL; pa=NULL; if(p==NULL) return ptr; else { while(p!=NULL) { pa=p; if(key<=p->data) p=p->lchild; else p=p->rchild; } if(key<=pa->data) pa->lchild=ptr; else pa->rchild=ptr; } return root; } return root; } void PreOrder(BiTree root) { if(root!=NULL) { printf("%d ",root->data); PreOrder(root->lchild); PreOrder(root->rchild); } }int main() { BiTree root ; root = Creat_Tree(); PreOrder(root); printf("\n");}以上代码输出存在错误应当如何进行修改

if (key <= p->data) p = p->lchild; else p = p->rchild; } if (key <= pa->data) pa->lchild = ptr; else pa->rchild = ptr; } scanf("%d", &data); // 读取下一个节点的值 } return root; } void ...

将此c++代码转换为c语言代码#include<iostream> #include<cstdlib> #include<cstdio> #include<stdio.h> #include<string.h> using namespace std; #define OK 1 #define ERROR 0 #define OVERFLOW - 2 #define MAXSIZE 100 typedef int Status; typedef int SElemType; typedef struct { SElemType base; SElemType top; int stacksize; } SqStack; Status InitStack(SqStack &s) { s.base = new SElemType[MAXSIZE]; if(!s.base) exit(OVERFLOW); s.top = s.base; s.stacksize = MAXSIZE; return OK; } void DestroyStack(SqStack &s) { delete []s.base; s.base = s.top = NULL; s.stacksize = MAXSIZE; } Status Push(SqStack &s, int x) { if((s.top-s.base)==s.stacksize)return ERROR; s.top=x; s.top++; return OK; } int Pop(SqStack &s) { int x; if(s.base==s.top)return ERROR; s.top--; x=s.top; return x; } void PrintStack(SqStack s) { for(SElemType top = s.top - 1; top >= s.base; top--) { cout << (top); if(top != s.base) cout << ' '; } cout << endl; } int main() { SqStack s; char op[10]; int x,y,temp,sum,len,i; InitStack(s); while(scanf("%s",op)&&strcmp(op,"@")) { if(!strcmp(op," ")) { scanf("%s",op); } else if(strcmp(op,"/")&&strcmp(op,"")&&strcmp(op,"+")&&strcmp(op,"-")) { temp=1,sum=0; len=strlen(op); for(i=len-1;i>=0;i--) { sum=sum+(op[i]-'0')temp; temp=10; } Push(s,sum); } else if(!strcmp(op,"+")) { x=Pop(s); y=Pop(s); Push(s,y+x); } else if(!strcmp(op,"-")) { x=Pop(s); y=Pop(s); Push(s,y-x); } else if(!strcmp(op,"/")) { x=Pop(s); y=Pop(s); Push(s,y/x); } else if(!strcmp(op,"")) { x=Pop(s); y=Pop(s); Push(s,y*x); } } PrintStack(s); DestroyStack(s); return 0; }

- 使用 <stdio.h> 和 <stdlib.h> 头文件代替 <iostream> 和 <cstdlib> 头文件； - 去掉 using namespace std;； - 将 typedef struct 改为 typedef； - 将 SqStack & 改为 SqStack *，并在函数内...

#include <iostream> #include <cstdio> #include <cstdlib> #include <cstring> #include "lib.h" void findBestItems(int index, int currentValue, int currentWeight, int itemWeights, int itemValues, int maxCapacity, int totalItems, int &highestValue, int *optimalItems, int **bestItemsList, int &bestItemCount, int currentItems) { if (index == totalItems) { if (currentValue > highestValue) { highestValue = currentValue; bestItemCount = 1; std::memcpy(optimalItems, currentItems, sizeof(int) totalItems); std::memcpy(bestItemsList[0], currentItems, sizeof(int) * totalItems); } else if (currentValue == highestValue) { std::memcpy(bestItemsList[bestItemCount], currentItems, sizeof(int) * totalItems); bestItemCount++; } return; } if (currentWeight + itemWeights[index] <= maxCapacity) { currentItems[index] = index + 1; findBestItems(index + 1, currentValue + itemValues[index], currentWeight + itemWeights[index], itemWeights, itemValues, maxCapacity, totalItems, highestValue, optimalItems, bestItemsList, bestItemCount, currentItems); } currentItems[index] = 0; findBestItems(index + 1, currentValue, currentWeight, itemWeights, itemValues, maxCapacity, totalItems, highestValue, optimalItems, bestItemsList, bestItemCount, currentItems); } Solution solveKnapsack(char inputFile) { FILE inputStream = std::fopen(inputFile, "r"); if (inputStream == NULL) { std::cout << "Error open file\n"; std::exit(1); } int maxCapacity; std::fscanf(inputStream, "%d", &maxCapacity); char inputLine[256]; std::fgets(inputLine, sizeof(inputLine), inputStream); std::fgets(inputLine, sizeof(inputLine), inputStream); char *item = std::strtok(inputLine, ","); int totalItems = 0; int itemValues[256]; while (item != NULL) { itemValues[totalItems] = std::atoi(item); item = std::strtok(NULL, ","); totalItems++; } std::fgets(inputLine, sizeof(inputLine), inputStream); item = std::strtok(inputLine, ","); int itemWeights[256]; for (int i = 0; i < totalItems; i++) { itemWeights[i] = std::atoi(item); item = std::strtok(NULL, ","); } std::fclose(inputStream); int highestValue = 0; int optimalItems[256]; int **bestItemsList = new int *[256]; for (int i = 0; i < 256; i++) { bestItemsList[i] = new int[totalItems]; } int bestItemCount = 0; int currentItems[256]; findBestItems(0, 0, 0, itemWeights, itemValues, maxCapacity, totalItems, highestValue, optimalItems, bestItemsList, bestItemCount, currentItems); Solution solution = {highestValue, bestItemsList, optimalItems, totalItems, bestItemCount}; return solution; }请帮我把这个cpp文件转换为c文件

if (currentWeight + itemWeights[index] <= maxCapacity) { currentItems[index] = index + 1; findBestItems(index + 1, currentValue + itemValues[index], currentWeight + itemWeights[index], itemWeights,...

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