CODEWITHSUNDEEP
c
Tharindu Sandaruwan
Tharindu Sandaruwan

Reputation: 195

C function and arrays without value change

I want to pass a array to function and I want to change it within the function without changing the original array using c. Can I do it?

This is what I have so far:

#include <stdio.h>

void display(int age[]) {
    age[0]=3;
    age[1]=4;
}
int main() {
    int ageArray[] = { 2,3 };
    display(ageArray);//Passing array element ageArray[2] only.
    printf("%d", ageArray[0]);
    return 0;
}

Upvotes: 0

Views: 201

Answers (1)

harper
harper

Reputation: 13690

C doesn't have to concept of passing arrays to a function. There is always a pointer passed to the function independent of the function signature:

void function(int *Array);
void function(int Array[]);

You must make a copy of the array if you want to avoid modification of the original array. For that purpose you must pass the size of the Array:

void function(int *Array, size_t Size);

Now you can create the copy.

Upvotes: 3

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