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

#define MAX_STRING_LENGTH 100
int main()
{
        char str1[MAX_STRING_LENGTH],str2[MAX_STRING_LENGTH];
        int pos;
        printf("\n\t\ _____________________________________");
	 printf("\n\n\t\t Welcome to our Program\n");
	 printf("\n\t _____________________________________\n");
        printf("\n\t Enter main string : ");
        scanf("%[^\n]%*c",str1);
        printf("\n\t Enter sub string : ");
        scanf("%[^\n]%*c",str2);
        printf("\n\t Enter position : ");
        scanf("%d",&pos);
        char *ptr=NULL;
        ptr=(char*)malloc(strlen(str1)+strlen(str2)+2);
        if(ptr==NULL)
        {
                printf("Unable to allocate memory\n");
                exit(1);
        }
        int totalPosition=0,i=0,j=0,count=0;
        for(;str1[i];i++)
        {
                if(str1[i]==' ')
                        totalPosition++;
        }
        if(pos==0)
        {
                strcpy(ptr,str2);
                strcat(ptr," ");
                strcat(ptr,str1);
        }
        else if(pos > totalPosition)
        {
                strcpy(ptr,str1);
                strcat(ptr," ");
                strcat(ptr,str2);
        }
        else
        {
                for(i=0;str1[i];i++)
                {
                        ptr[j++]=str1[i];
                        if(str1[i]==' ')
                        {
                                count++;
                                if(count==pos)
                                {
                                        int k=0;
                                        for(;str2[k];k++)
                                                ptr[j++]=str2[k];
                                        ptr[j++]=' ';
                                }
                        }
                }
        }
        printf("\n\t String is %s\n",ptr);
        free(ptr);
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}