source: doc/theses/mike_brooks_MMath/programs/hello-array.cfa @ d987881

#include <common.hfa>
#include <bits/align.hfa>

extern "C" {
    int atoi(const char *str);
}


#include "stdlib.hfa"
#include "array.hfa" // learned has to come afer stdlib, which uses the word tag
















// Usage:
// ./a.out 5
// example does an unchecked reference to argv[1]



















forall( ztype( N ) )
array(bool, N) & f( array(float, N) & a, array(float, N) & b ) {
    array(bool, N) & ret = *alloc();
    for( i; z(N) ) {
        float fracdiff = 2 * abs( a[i] - b[i] )
                       / ( abs( a[i] ) + abs( b[i] ) );
        ret[i] = fracdiff < 0.005;
    }
    return ret;
}






































// TODO: standardize argv

int main( int argc, char ** argv ) {
    int n = atoi(argv[1]);
    array(float, Z(n)) a, b;
    for (i; n) {
        a[i] = 3.14 / (i+1);
        b[i] = a[i] + 0.005 ;
    }
    array(bool, Z(n)) & answer = f( a, b );
    printf("answer:");
    for (i; n)
        printf(" %d", answer[i]);
    printf("\n");
    free( & answer );
}
/*
$ ./a.out 5
answer: 1 1 1 0 0 
$ ./a.out 7
answer: 1 1 1 0 0 0 0 
*/
















forall( ztype(M), ztype(N) )
void not_so_bad(array(float, M) &a, array(float, N) &b ) {
    f( a, a );
    f( b, b );
}







#ifdef SHOWERR1

forall( ztype(M), ztype(N) )
void bad( array(float, M) &a, array(float, N) &b ) {
    f( a, a ); // ok
    f( b, b ); // ok
    f( a, b ); // error
}

#endif






































forall( ztype(M), ztype(N) )
void bad_fixed( array(float, M) &a, array(float, N) &b ) {
    

    if ( z(M) == z(N) ) {
        f( a, ( array(float, M) & ) b ); // fixed
    }

}