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int arr2d_sumElements( int arr2d[][NCOLS], int nrows ){        
    int sum = 0;        
    // sanity check        
    if ( !arr2d || nrows < 1 )               
    return INT_MIN;        
    // actual calc        
    int *walk = (int *)arr2d;                       
    // address of arr2d's 1st int element        
    int *stop = ((int *)arr2d + nrows * NCOLS);     
    // address of arr2d's last int element       
    while ( walk < stop )                
    sum += *walk++;        
    return sum;
 
}

prog.c:1: error: ‘NCOLS’ undeclared here (not in a function)
prog.c: In function ‘arr2d_sumElements’:
prog.c:5: error: ‘INT_MIN’ undeclared (first use in this function)
prog.c:5: error: (Each undeclared identifier is reported only once
prog.c:5: error: for each function it appears in.)
prog.c:9: error: ‘NCOLS’ undeclared (first use in this function)

Standard output is empty