Smartprix coding , C (gcc)

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#include<iostream>
#include<conio.h>
#include<ctype.h>
#include<stdio.h>
using namespace std;
int main()
{
	clrscr();
	char str[50];
	char one[10],two[10],three[10];
	cout<<"\nEnter any String:";
	gets(str);
	//int l=strlen(str);
	//cout<<"\nEnter string is:"<<str;
	for(int i=0;str[i]!='\0';i++)
	{
		switch(str[i])
		{
			case '@':if(isalpha(str[i])!=0)
				 one[i]=str[i];
				 else if(isdigit(str[i])!=0)
				 one[i]=str[i];
				 else if(str[i]==' ')
				 one[i]=str[i];
			case '#':if(isalpha(str[i])!=0)
				 two[i]=str[i];
				 else if(isdigit(str[i])!=0)
				 two[i]=str[i];
				 else if(str[i]==' ')
				 two[i]=str[i];
			case '^':if(isalpha(str[i])!=0)
				 three[i]=str[i];
				 else if(isdigit(str[i])!=0)
				 three[i]=str[i];
				 else if(str[i]==' ')
				 three[i]=str[i];
		}
	}
	//cout<<"\nEnter string is:"<<str;
	int j=0;
	for(i=0;one[i]!='\0';i++)
	{
		if(one[i]>='a' && one[i]<='z')
		one[i]=one[i]-32;
		else if(one[i]>='A' && one[i]<='Z')
		one[i]=one[i]+32;
	}
	for(i=0;str[i]!='\0';i++)
	{
		if(isalpha(str[i])!=0)
		cout<<str[i];
		else if(isdigit(str[i])!=0)
		cout<<str[i];
		else if(str[i]==' ')
		cout<<str[i];
		else if(str[i]=='@')
		{
			for(j=0;one[j]!='\0';j++)
			//if(one[j]>=97 && one[j]<=122)
			//one[j]=one[j]-32;
			cout<<one[j];
		}
		else if(str[i]=='#')
		{	cout<<"\n";
			for(j=0;two[j]!='\0';j++)
			cout<<two[j];
		}
		else if(str[i]=='^')
		{	cout<<"\n";
			for(j=0;three[j]!='\0';j++)
			cout<<three[j];
		}
	}
	getch();
	return 0;	
}

#include<iostream.h>
#include<conio.h>
#include<ctype.h>
#include<stdio.h>
using namespace std;
int main()
{
	clrscr();
	char str[50];
	char one[10],two[10],three[10];
	cout<<"\nEnter any String:";
	gets(str);
	//int l=strlen(str);
	//cout<<"\nEnter string is:"<<str;
	for(int i=0;str[i]!='\0';i++)
	{
		switch(str[i])
		{
			case '@':if(isalpha(str[i])!=0)
				 one[i]=str[i];
				 else if(isdigit(str[i])!=0)
				 one[i]=str[i];
				 else if(str[i]==' ')
				 one[i]=str[i];
			case '#':if(isalpha(str[i])!=0)
				 two[i]=str[i];
				 else if(isdigit(str[i])!=0)
				 two[i]=str[i];
				 else if(str[i]==' ')
				 two[i]=str[i];
			case '^':if(isalpha(str[i])!=0)
				 three[i]=str[i];
				 else if(isdigit(str[i])!=0)
				 three[i]=str[i];
				 else if(str[i]==' ')
				 three[i]=str[i];
		}
	}
	//cout<<"\nEnter string is:"<<str;
	int j=0;
	for(i=0;one[i]!='\0';i++)
	{
		if(one[i]>='a' && one[i]<='z')
		one[i]=one[i]-32;
		else if(one[i]>='A' && one[i]<='Z')
		one[i]=one[i]+32;
	}
	for(i=0;str[i]!='\0';i++)
	{
		if(isalpha(str[i])!=0)
		cout<<str[i];
		else if(isdigit(str[i])!=0)
		cout<<str[i];
		else if(str[i]==' ')
		cout<<str[i];
		else if(str[i]=='@')
		{
			for(j=0;one[j]!='\0';j++)
			//if(one[j]>=97 && one[j]<=122)
			//one[j]=one[j]-32;
			cout<<one[j];
		}
		else if(str[i]=='#')
		{	cout<<"\n";
			for(j=0;two[j]!='\0';j++)
			cout<<two[j];
		}
		else if(str[i]=='^')
		{	cout<<"\n";
			for(j=0;three[j]!='\0';j++)
			cout<<three[j];
		}
	}
	getch();
	return 0;	
}

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Compilation time: 0.12 sec, absolute service time: 0,21 sec