重新排列给定的源代码

给定一个字符串str ，其中包含未正确安排的源代码(C / C++ / Java代码)，任务是以正确的方式格式化该代码并打印结果。

例子：

Input: str = "#includeint main(){ cout << \"geeksforgeeks\" }"
Output:
#include
int main()
{
 cout << "geeksforgeeks" 
}

Input: str = "#includeint main() { int a, b, c; c=a+b; printf(\"%d\", c); return 0; }"
Output:
#include
int main() 
{
 int a, b, c;
 c=a+b;
 printf("%d", c);
 return 0;

}

方法：检查各种条件，例如＃ ， { ， } ， ( ) ， < ， > ，;并根据需要设置代码格式。如果不需要更改或无法格式化代码，请照原样打印代码。

下面是上述方法的实现：

C++

// CPP program to rearrange the given source code
#include 
using namespace std;
  
// Function to rearrange the code
void rearrange(string str)
{
    string replaced;
  
    int Open_paren = 0, Open_Braces = 0;
    int Lessrthan = 0, i = 0, j = 0;
  
    do {
  
        // Various Conditions For The Code
        if (str[i] == '#' || str[i] == '<' || str[i] == '>'
            || str[i] == ';' || str[i] == '}' || str[i] == '{'
            || str[i] == '(' || str[i] == ')') {
  
            // Check for opening braces
            if (str[i] == '{')
                Open_Braces++;
  
            // Check for closing braces
            if (str[i] == '}')
                Open_Braces--;
  
            // For less than symbol
            if (str[i] == '<' && Open_paren == 0)
                Lessrthan++;
  
            // For greater than symbol
            if (str[i] == '>' && Open_paren == 0)
                Lessrthan--;
  
            // For open parenthesis
            if (str[i] == '(') {
                Lessrthan = 0;
                Open_paren++;
            }
  
            // For closing parenthesis
            if (str[i] == ')')
                Open_paren--;
  
            if (Open_paren > 0) {
                replaced += str[i];
            }
            else {
  
                // Replace the plain code
                // for closing parenthesis
                if (str[i] == ')')
                    replaced += str[i];
  
                // Replace the code for open and close braces
                else if (str[i] == '{' || str[i] == '}') {
                    replaced += '\n';
                    replaced += str[i];
                    replaced += '\n';
                }
                else if (Lessrthan > 0)
                    replaced += str[i];
  
                // Replace the code for # symbol
                else if (str[i] == '#') {
                    replaced += '\n';
                    replaced += str[i];
                }
                else {
                    replaced += str[i];
                    replaced += '\n';
                }
            }
        }
  
        // If all conditions do not
        // work then print the code as it is
        else {
            replaced += str[i];
        }
  
        i++;
  
    } while (i < str.length());
    replaced += '\0';
  
    // Print formatted code
    for (i = 0; i < replaced.length(); i++)
        cout << replaced[i];
    printf("\n");
}
  
// Driver Code
int main()
{
  
    string str = "#includeint main()"
                 "{ int a, b, c; c=a+b; printf(\"%d\", c);"
                 " return 0; }";
  
    // Function call
    rearrange(str);
  
    return 0;
}

输出：

#include
int main()
{
 int a, b, c;
 c=a+b;
 printf("%d", c);
 return 0;
 
}

想要从精选的最佳视频中学习并解决问题，请查看有关从基础到高级C++的C++基础课程以及有关语言和STL的C++ STL课程。要完成从学习语言到DS Algo等的更多准备工作，请参阅“完整面试准备课程” 。