C++ Quiz 3: Structs and Pointers - Prof. Richard Ord, Quizzes of Computer Science

Download C++ Quiz 3: Structs and Pointers - Prof. Richard Ord and more Quizzes Computer Science in PDF only on Docsity! Login name _________________ Quiz 3 Name ______________________ CSE 131 Signature ___________________ Winter 2011 Student ID __________________ 1. Given the following C++ definitions (similar to Reduced-C) struct S1 { int a; }; struct S2 { int a; }; void foo ( struct S2 &b ) { } struct S1 a; a call to foo( a ) passing in a as the actual argument will cause a compiler error. Why? Fix the function call foo( a ) below to pass a to foo() without causing a C++ compiler error. foo( _________________________________________ a ); Using Reduced-C syntax, define a variable named myPtr that is pointer to an array of 5 ints. This will take two lines of code. Show the memory layout of the following C struct definition taking into consideration the SPARC data type memory alignment restrictions discussed in class. Fill bytes in memory with the appropriate struct member/field name. For example, if member/field name p takes 4 bytes, you will have 4 p's in the appropriate memory locations. If the member/field is an array, use the name followed by the index number. For example, some number of p[0]s, p[1]s, p[2]s, etc. Place an X in any bytes of padding. Structs and unions are padded so the total size is evenly divisible by the most strict alignment requirement of its members. lower memory struct foo { char a; fubar: short b; short *c; short d[3]; double e; short f; char g; }; struct foo fubar; What is the offsetof( struct foo, f )? ________ What is the offsetof( struct foo, a )? ________ What is the sizeof( struct foo )? ________ If struct foo had been defined as union foo instead, what would be the sizeof( union foo )? ________ higher memory