int total_dia1,total_dia2,total_dia3,total_dia4,total_dia5,total_dia6,total_dia7,total_dia8,total_dia9,total_dia10,total_dia11,total_dia12,total_dia13,total_dia14,total_dia15,total_dia16,total_dia17,total_dia18,total_dia19,total_dia20,total_dia21,total_dia22,total_dia23,total_dia24,total_dia25,total_dia26,total_dia27,total_dia28,total_dia29,total_dia30,total_dia31;
 
es decir desde (total_dia1 [b]hasta[/b] total_dia31 )cada una es un numero entero que representa la cantidad de compras del día, ahora quiero saber cual de ellos es el numero mayor.
 para seguir haciendo otras operaciones que lograre sacar, sabiendo esto,
 
yo lo se hacer con la condicional if pero no se si haya una forma mas fácil, para no tener que hacer un código de 31 interacciones 
 
es decir ya lo estaba haciendo así, pero me gustaría saber si hay una forma mas rápida
 
que esta
 
	if (total_dia1>total_dia2 && total_dia1>total_dia3 && total_dia1>total_dia4 && total_dia1>total_dia5 && total_dia1>total_dia6 && total_dia1>total_dia7 && total_dia1>total_dia8 && total_dia1>total_dia9 && total_dia1>total_dia10 && total_dia1>total_dia11 && total_dia1>total_dia12 && total_dia1>total_dia13 && total_dia1>total_dia14 && total_dia1>total_dia15 && total_dia1>total_dia16 && total_dia1>total_dia17 && total_dia1>total_dia18 && total_dia1>total_dia19 && total_dia1>total_dia20 && total_dia1>total_dia21 && total_dia1>total_dia22 && total_dia1>total_dia23 && total_dia1>total_dia24 && total_dia1>total_dia25 && total_dia1>total_dia26 && total_dia1>total_dia27 && total_dia1>total_dia28 && total_dia1>total_dia29 && total_dia1>total_dia30 && total_dia1>total_dia31)
	{
		cout<<"Mejor dia: 1"<<endl
	}
	else
	{
	   if (total_dia2>total_dia1 && total_dia2>total_dia3 && total_dia2>total_dia4 && total_dia2>total_dia5 && total_dia2>total_dia6 && total_dia2>total_dia7 && total_dia2>total_dia8 && total_dia2>total_dia9 && total_dia2>total_dia10 && total_dia2>total_dia11 && total_dia2>total_dia12 && total_dia2>total_dia13 && total_dia2>total_dia14 && total_dia2>total_dia15 && total_dia2>total_dia16 && total_dia2>total_dia17 && total_dia2>total_dia18 && total_dia2>total_dia19 && total_dia2>total_dia20 && total_dia2>total_dia21 && total_dia2>total_dia22 && total_dia2>total_dia23 && total_dia2>total_dia24 && total_dia2>total_dia25 && total_dia2>total_dia26 && total_dia2>total_dia27 && total_dia2>total_dia28 && total_dia2>total_dia29 && total_dia2>total_dia30 && total_dia2>total_dia31)
	  {
		cout<<"Mejor dia: 2"<<endl
	  }
	  else
	  {
              etc...............31 veces
 

#include<stdio.h>
 
int main()	{	
	int mayor = -1000000;
	int ventas[31] = { 0 };
	int i = 0;
	while(i< 31)	{
		if(ventas[i] > mayor)	{
			mayor = ventas[i];
		}
		i++;
	}
	printf("El mayor es %i\n",mayor);
	return 0;
}