C / C++ / MFC

// shift every character to the left that is not a space
char str[] = "This string has spaces";
int x, y;
 
for (x = 0, y = 0; str[x] != '\0'; x++)
{
    if (' ' != str[x])
    {
        str[y] = str[x];
        y++;
    }
}
 
str[y] = '\0';

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

#pragma auto_inline(off)
 
void Test(int x, int y, char* str)
{
   str[y] = str[x];
   y++;
}
 
void Test2(int x, int y, char* str)
{
   str[y++] = str[x];
}

void Test(int x, int y, char* str)
{
   str[y] = str[x];
004016C0  mov         eax,dword ptr [esp+0Ch] 
004016C4  mov         ecx,dword ptr [esp+4] 
004016C8  mov         dl,byte ptr [ecx+eax] 
004016CB  mov         ecx,dword ptr [esp+8] 
004016CF  mov         byte ptr [ecx+eax],dl 
   y++;
}
004016D2  ret

//void Test(int x, int y, char* str)
void Test(int x, int& y, char* str)
{
   str[y] = str[x];
   y++;
}

void Test(int x, int& y, char* str)
{
   str[y] = str[x];
004016D0  mov         eax,dword ptr [esp+8] 
004016D4  mov         ecx,dword ptr [esp+0Ch] 
004016D8  mov         edx,dword ptr [eax] 
004016DA  push        ebx  
004016DB  push        esi  
004016DC  mov         esi,dword ptr [esp+0Ch] 
004016E0  mov         bl,byte ptr [esi+ecx] 
004016E3  mov         byte ptr [ecx+edx],bl 
   y++;
004016E6  add         dword ptr [eax],1 
004016E9  pop         esi  
004016EA  pop         ebx  
}
004016EB  ret              

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

"One must learn from the bite of the fire to leave it alone." - Native American Proverb