std::string buffer=std::string("!!!")+*argv;

std::string buffer=std::string("Prefix: ") + *argv;

#include <stdio.h>

int main(int argc, char* argv[])
{
        printf("Hi, you entered value: %s\n",(argc > 1)?argv[1]:"\rHi, you entered no value ");
        return 0;
}
//---------------------------------------------------------------------------

#include <iostream.h>

int main(int argc, char* argv[])
{
     string str ="";
     cout <<(str = ((argc > 1) ? ( string("Hi, you entered value: ")+ argv[1]):string("Hi, you entered no value"))) << endl;
     cin.get();
     return 0;
}

#include <stdlib.h>
void main(int argc, char* argv[])
{
	argv[0] = "ur param is : ";
	while(argc--)
		printf("%s ", argv[__argc - argc - 1]);
}

void main(int argc, char* argv[])
{
	argv[0] = "ur param is : ";
	argc |= argc<<16;
	while(argc-- & 0xffff)
		printf(" %s", argv[(argc >> 16) - (0xffff & argc) - 1]);
}

void main(int argc, char* argv[])
{
	while(argc-- > 1)
		argv[argc][-1] = 0x20;
	printf("ur param is :  %s", argv[1]);
}

18:   void main(int argc, char* argv[])
19:   {
004010C0   push        ebp
004010C1   mov         ebp,esp
004010C3   sub         esp,40h
004010C6   push        ebx
004010C7   push        esi
004010C8   push        edi
004010C9   lea         edi,[ebp-40h]
004010CC   mov         ecx,10h
004010D1   mov         eax,0CCCCCCCCh
004010D6   rep stos    dword ptr [edi]
20:       while(argc-- > 1)
004010D8   mov         eax,dword ptr [ebp+8]
004010DB   mov         ecx,dword ptr [ebp+8]
004010DE   sub         ecx,1
004010E1   mov         dword ptr [ebp+8],ecx
004010E4   cmp         eax,1
004010E7   jle         main+38h (004010f8)
21:           argv[argc][-1] = 0x20;
004010E9   mov         edx,dword ptr [ebp+8]
004010EC   mov         eax,dword ptr [ebp+0Ch]
004010EF   mov         ecx,dword ptr [eax+edx*4]
004010F2   mov         byte ptr [ecx-1],20h
004010F6   jmp         main+18h (004010d8)
22:       printf("ur param is :  %s", argv[1]);
004010F8   mov         edx,dword ptr [ebp+0Ch]
004010FB   mov         eax,dword ptr [edx+4]
004010FE   push        eax
004010FF   push        offset string "ur param is :  %s" (00422034)
00401104   call        printf (00401140)
00401109   add         esp,8
23:   }