Bifalgorithm post · Computer science one · Passing By Reference

How can pointers be used to pass variables by reference?

How can pointers be used to pass variables by reference? (Computer science one · Passing By Reference) — "Now that we have the ability to reference a memory lo…

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Passing variables by reference with pointers
Pointers allow functions to reference memory locations
The asterisk syntax identifies pointer variables
The dereferencing operator accesses or modifies the pointed-to value
Functions demonstrate passing values and references
Function prototypes declare sum and swap
sum receives two values by value and a third variable by reference
sum calculates a plus b and stores the result through c
swap receives two variables by reference
swap uses a temporary variable to exchange the pointed-to values

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How can pointers be used to pass variables by reference?

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Computer science one

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sam23

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"Now that we have the ability to reference a memory location using pointers, we can write functions that pass variables by reference. To do so, we use the same asterisk syntax used with pointer variables. In the function definitions, we can use the dereferencing operator to access or modify the value stored in the variable pointed to by the pointer.\n\n1 //prototypes\n\n2 /**\n\n3 * This function sums the first two variables (passed by\n\n4 * value) and places the result into the third variable\n\n5 * (passed by reference).\n\n6 */\n\n7 void sum(int a, int b, int *c);\n\n8\n\n9 /**\n\n10 * This function swaps the values stored in the\n\n11 * two variables passed by reference.\n\n12 */\n\n13 void swap(int *a, int *b);\n\n1 void sum(int a, int b, int *c) {\n\n2 int x = a + b;\n\n3 *c = x;\n\n4 return;\n\n5 }\n\n6\n\n7 void swap(int *a, int *b) {\n\n8 int temp = *a;\n\n9 *a = *b;\n\n10 *b = temp;\n\n11 return;\n\n12 }"

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