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Questions - pass-by-value

NEWBIE: passing a pointer to a function

I'm trying to relearn C from dabbling with it about 5 year ago. Specifically, I'm trying to learn how to extract a number of operations from main and make them into a function, with the aim of moving ...
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Kevin Zembower

c

pointers

pass-by-reference

pass-by-value

function-declaration

Votes: 0

Answers: 3

Latest Answer

The problem is that the pointer fp is passed to the function getfile by value. getfile(fp); That is the function deals with a copy of the value of the passed pointer fp. So changing the copy in the f...
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Vlad from Moscow

How to increment "char *" inside a function without returning it?

I have something like this (simplified): void count(char *fmt) { while (*fmt != 'i') { fmt++; } printf("%c %p\n", *fmt, fmt); } int main(void) { char *a = "...
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MiguelP

c

pointers

pass-by-reference

pass-by-value

function-definition

Votes: 0

Answers: 1

Latest Answer

Pass the pointer to the function by reference. In C passing by reference means passing an object indirectly through a pointer to it. So dereferencing the pointer you will have a direct access to the o...
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Vlad from Moscow

A design question about Go's map and slice troubled me a lot

Why does Go's slice has 'replication trap', but map does not? Suppose we have a function that takes slice as an input parameter, and if slice is expanded in the function, only the copied slice structu...
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qizong007

go

slice

pass-by-reference

pass-by-value

go-map

Votes: 0

Answers: 2

Latest Answer

This was also asked on the golang-nuts mailing list, with this as part of the reply from Brian Candler: I think you have understood the issue well. From the source code at https://golang.org/src/runt...
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thepudds

Changing the value of an element in a struct

I'm new to structs. I am trying to write a program that has a struct, and the struct is supposed to store a character array and its length. I want to be able change the length's value as I would be cr...
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lazearoundallday

c

struct

pass-by-reference

pass-by-value

function-declaration

Votes: 0

Answers: 3

Latest Answer

For starters the order of evaluation of arguments in a function call is unspecified. So in this call printf("%d %d\n",strleng(A),A.length); the evaluation of the argument expression A.leng...
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Vlad from Moscow

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