Pass Pointers to Functions in C

In this article, we will show you, How to write a C Program to pass Pointers to Functions. Or How the Pointers to Functions in C programming work with a practical example.

TIP: Suggest you refer, Call By Value and Call by Reference and Pointers article to understand the function arguments, and pointers.

Pass Pointers to Functions in C Example 1

Like any other variable, you can pass the pointer as a function argument.

In this Pass Pointers to Functions in C program, we created a function that accepts two integer variable and swaps those two variables. I suggest you refer, C Program to Swap two numbers article to understand the logic.

/* Pass Pointers to Functions in C Example  */

#include<stdio.h>
 
void Swap(int *x, int *y)
{
    int Temp;
    Temp = *x;
    *x = *y;
    *y = Temp;
}

int main()
{
    int a, b;
    
    printf ("Please Enter 2 Integer Values :  ");
    scanf("%d %d", &a, &b);
    
    printf("\nBefore Swapping  A = %d and B = %d", a, b);
    
    Swap(&a, &b);
    
    printf(" \nAfter Swapping   A = %d and B = %d \n", a, b);
}

OUTPUT

Pass Pointers to Functions in C Example 2

In this Pass Pointers to Functions in C program, we created a function that accepts the array pointer and its size. I suggest you refer C program to find Sum of All Elements in an Array article to understand the function logic.

Within the main Pass Pointers to Functions in C program, we used for loop to iterate the array. Next, pass user given element to an array. Next, we are passing an array to a function

/* Pass Pointers to Functions in C Example  */

#include<stdio.h>
 
int SumofArrNumbers(int *arr, int Size)
{
    int sum = 0;
    for(int i = 0; i < Size; i++)
    {
        sum = sum + arr[i];
    }
    return sum;
}
int main()
{
    int i, Addition, Size, a[10];
    printf("Please Enter the Size of an Array : ");
    scanf("%d", &Size);
    
    printf("\nPlease Enter Array Elements  :  ");
    for(i = 0; i < Size; i++)
    {
        scanf("%d", &a[i]);
    }
    
    Addition = SumofArrNumbers(a, Size);
    printf("Sum of Elements in this Array = %d \n", Addition);
    return 0;
}

OUTPUT

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