Diofante < Requer +testes>

#include <stdio.h>

int Elev(int num, int x);
int Equal(int num, int numx);
int Diof(int num);

int main()
{
    int NumInput, temp;
    NumInput = temp = 0;

    printf("Introduza um numero: ");
    scanf("%d", &NumInput);

    Diof(NumInput);


}
int Elev(int num, int x)
{
    int temp=1;
    for(;x>0;x--)
    {
        temp *= num;
    }
    return temp;
}
int Equal(int num, int numx)
{
    return (num == numx) ? 1 : 0;
}
int Diof(int num)
{
    int x1, x2, x3, x4;
    x1 = x2 = x3 = x4 = 0;

    for(x1=1;x1<=9;x1++)
    {
        for(x2=x1;x2<=9;x2++)
        {
            if( Equal( Elev(x1, 2) + Elev(x2, 2),num) )
                printf("%d^2 + %d^2 = %d\n", x1, x2, num);

            for(x3=x2;x3<=9;x3++)
            {
                if( Equal( Elev(x1, 2) + Elev(x2, 2) + Elev(x3, 2),num) )
                        printf("%d^2 + %d^2 + %d^2 = %d\n", x1, x2, x3, num);

                for(x4=x3;x4<=9;x4++)
                {
                    if( Equal( Elev(x1, 2) + Elev(x2, 2) + Elev(x3, 2) + Elev(x4, 2),num) )
                        printf("%d^2 + %d^2 + %d^2 + %d^2 = %d\n", x1, x2, x3, x4, num);
                }
            }
        }
    }
}