source: src/examples/sum.c @ 00cc023

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// sum.c -- 
//
// Author           : Richard C. Bilson
// Created On       : Wed May 27 17:56:53 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Wed May 27 18:43:46 2015
// Update Count     : 4
//

extern "C" {
        int printf( const char *, ... );
}

context sumable( type T ) {
        const T 0;
        T ?+?( T, T );
        T ?++( T * );
        T ?+=?( T *, T );
};

forall( type T | sumable( T ) )
T sum( int n, T a[] ) {
        T total;                                                                                        // instantiate T, select 0
        total = 0;
        for ( int i = 0; i < n; i += 1 )
                total = total + a[i];                                                   // select +
        return total;
}

// Required to satisfy sumable as char does not have addition.
const char 0;
char ?+?( char op1, char op2 ) { return op1 + op2; }
char ?++( char *op ) { return *op + 1; }

const double 0; // TEMPORARY, incorrect use of int 0

int main() {
        const int size = 10, low = 0, High = 10;
        int si = 0, ai[10]; // size
        int i;
        for ( i = low; i < High; i += 1 ) {
                si += i;
                ai[i] = i;
        }
        printf( "sum from %d to %d is %d, check %d\n",
                        low, High, sum( size, ai ), si );

//      char ci[10];
//      char c = sum( size, ci );
//      float fi[10];
//      float f = sum( size, fi );

        double sd = 0.0, ad[10];                                                        // size
        for ( i = low; i < High; i += 1 ) {
                double d = i / (double)size;
                sd += d;
                ad[i] = d;
        }
        printf( "sum from %g to %g is %g, check %g\n",
                        low / (double)size, High / (double)size, sum( size, ad ), sd );
}

// Local Variables: //
// tab-width: 4 //
// compile-command: "cfa sum.c" //
// End: //