#include <iostream>
#include <string.h>
 
int main()
{
 
	char FileName[7]; // space for 6 characters + 1 for the nul terminator
	FileName[0] = '0';
	FileName[1] = '1';
	FileName[2] = '2';
	FileName[3] = '3';
	FileName[4] = '4';
	FileName[5] = '5';
	FileName[6] = '\0'; // Very important to add a 0 at the end of the char array, to make a valid C-string
	printf( "FileName = %s\n", FileName );
 
	char FileNameWithSlash1[8] = "/"; // space for `/` + file name
	strcat( FileNameWithSlash1, FileName );
	printf( "FileNameWithSlash1 = %s\n", FileNameWithSlash1 );
 
	char FileNameWithSlash2[8]; // space for `/` + file name
	sprintf( FileNameWithSlash2, "/%s", FileName );
	printf( "FileNameWithSlash2 = %s\n", FileNameWithSlash2 );
 
	return 0;
}

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