Category: Pointers in C

Operations on Pointers in C 0

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Operations on Pointers in C

The only operations that can be carried out on pointers in C are summarized below: A pointer variable in C can be assigned the address of an ordinary variable (e.g., pv = &v) A pointer variable can be assigned the value of another pointer variable (e.g., pv = px) provided both the pointers point to objects of the same data type A pointer variable in C can be assigned a null (zero) value (e.g., pv = NULL, where NULL is a symbolic constant that represents the value 0) An integer quantity can be added to or subtracted from a pointer...

Passing pointers to functions in C 1

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Passing pointers to functions in C

Pointers in C are often passed to a function as arguments. This allows data items within the calling portion of the program to be accessed by the function, altered within the function, and then returned to the calling portion of the program in altered form. We call this use of pointers in functions as passing arguments by reference (or by address or by location), in contrast to passing arguments by value. When an argument is passed by value, the data item is copied to the function. Thus, any alteration made to the data item within the function is not carried...

Understanding the difference between pass by value and pass by reference in C 0

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Understanding the difference between pass by value and pass by reference in C

Let us understand the difference between pass by value and pass by reference in C. Given below is a simple C program that illustrates the difference between ordinary arguments, which are passed by value, and pointer arguments, which are passed by reference. #include<stdio.h> void funct1(int a, int b); /*function prototype*/ void funct2(int *pa, int *pb); /*function prototype*/ void main() { int a = 1; int b = 3; printf(“\nBefore calling funct1: a=%d b=%d”, a, b); funct1(a, b); printf(“\nAfter calling funct1: a=%d b=%d”, a, b); printf(“\nBefore calling funct2: a=%d b=%d”, a, b); funct2(&a, &b); printf(“\nAfter calling funct2: a=%d b=%d”, a, b);...

Operations on Pointers in C Programming Language 3

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Operations on Pointers in C Programming Language

In C Programming Language, the only operations that can be carried out on pointers are summarized below: A pointer variable can be assigned the address of an ordinary variable (e.g., pv = &v) A pointer variable can be assigned the value of another pointer variable (e.g., pv = px) provided both the pointers point to objects of the same data-type A pointer variable can be assigned a null (zero) value (e.g., pv =NULL, where NULL is a symbolic constant that represents the value 0) An integer quantity can be added to or subtracted from a pointer variable (e.g., pv +...

Pointer Operations Demo in C 12

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Pointer Operations Demo in C

Here, we will demonstrate pointer operations in C programming. #include #include void main(){ int arr[5]={12,13,14,15,16}; int *ptrArr, *ptrArr1,i; clrscr(); ptrArr = arr; printf(“\nPrinting the first element of array: %d\n\n”,*ptrArr); /*Pointer variable can be increased. If added 1 to it, it will point to the next element of the same array*/ for(i=0;i<5;i++){ printf(“%d\t”, *ptrArr); ptrArr++; } printf(“\n\n”); /*Now the Pointer is pointing to a memory location that is not reserved so if you will print the value at pointer location it will print garbage and some times it show any RUN TIME error because C compiler will not check array boundaries*/...

Pointers in C 38

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Pointers in C

Pointers in C is one of the excellent feature introduced in C. It makes the programming very interesting. A pointer in C is a variable that represents the location (rather than the value) of a data item. Talking like a layman, C pointers points to an object or something. Let us understand C pointers in detail. Before learning the basics of pointers, let us understand how the variable is stored in the memory. When we declare a variable and assign a value to the variable, we are actually naming the memory location at which the value will be stored. The...

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