C Pointers

Pointers to C Examples Using Pointers

• Program 3 shows how scanf uses addresses/pointers to achieve pass-by-reference, and includes two functions (one broken, one working) that attempt to get two numbers from a user. The broken one is broken because the parameters are being passed by value. The working function uses pointers instead to achieve the effect of pass-by-reference.
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• Program 4 reads 2 numbers to fill the members of a struct. It passes the struct "by reference" (really by address/pointer) for space efficiency (the pointer takes less space than the struct). The fill2Nums function also illustrates taking the address of a struct member.