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Pointer is a variable which stores the address of other variable.Pointer declaration, initialization and accessingConsider the following statement −int qty = 179;Declaring a pointerint *p;‘p’ is a pointer variable that holds the address of another integer variable.Initialization of a pointerAddress operator (&) is used to initialize a pointer variable.int qty = 175; int *p; p= &qty;Let’s consider an example how the pointer is useful in accessing the elements in an array of string.In this program, we are trying to access an element which is present at particular location. The location can be found by using an operation.By adding pre incremented ... Read More
ProblemFind out the maximum and minimum from an array using dynamic memory allocation in C.SolutionThe Dynamic memory allocation enables the C programmers to allocate memory at runtime.The different functions that we used to allocate memory dynamically at run time are −The malloc () − allocates a block of memory in bytes at runtime.The calloc () − allocates continuous blocks of memory at runtime.The realloc () − used to reduce (or) extend the allocated memory.The free () − deallocates previously allocated memory space.Finding maximum and minimum number in an array using dynamic memory allocationThe logic for finding maximum element in an ... Read More
ProblemLet’s write a C program to compute the row sum and column sum of a 5 x 5 array using run time compilation.SolutionIn this program, we are entering the values of array which is of size 5X5 matrix during runtime in the console, with the help of for loops we are trying to add rows and columns.Logic for doing row sum is given below −for(i=0;i
Array Of PointersJust like any other data type, we can also declare a pointer array.Declarationdatatype *pointername [size];For example, int *p[5]; //It represents an array of pointers that can hold 5 integer element addressesInitializationThe ‘&’ is used for initializationFor example,int a[3] = {10,20,30}; int *p[3], i; for (i=0; i
Pointer is a variable which stores the address of other variable.Pointer declaration, initialization and accessingConsider the following statement −int qty = 179;Declaring a pointerint *p;‘p’ is a pointer variable that holds the address of another integer variable.Initialization of a pointerAddress operator (&) is used to initialize a pointer variable.int qty = 175; int *p; p= &qty;Arithmetic operations using pointersPointer variables can be used in expressions. For example, if pointer variables are properly declared and initialized then the following statements are valid.a) *p1 + *p2 b) *p1- *p2 c) *p1 * *p2 d) *p1/ *p2 Note: There must be a blank ... Read More
If individual elements are to be passed as arguments, then array elements along with their subscripts must be given in function call.To receive the elements, simple variables are used in function definition.Example 1#include main (){ void display (int, int); int a[5], i; clrscr(); printf (“enter 5 elements”); for (i=0; i
ArrayThe array is a group of related items that store with a common name. Following are the two ways of passing arrays as arguments to functions −sending entire array as argument to functionsending individual elements as argument to functionSending entire array as an argument to a functionTo send entire array as argument, just send the array name in the function call.To receive an array, it must be declared in the function header.Example 1#include main (){ void display (int a[5]); int a[5], i; clrscr(); printf ("enter 5 elements"); for (i=0; i
ProblemWhat is the logic in C language to print the numbers in different formats like pyramid, right angle triangle?SolutionTo print the numbers or symbols in different model we can take the help of for loop in the code.Example1Following is the C program to print pyramid − Live Demo#include int main(){ int n; printf("Enter number of lines: "); scanf("%d", &n); printf(""); // loop for line number of lines for(int i = 1; i
Local scopeLocal scope specifies that variables defined within the block are visible only in that block and invisible outside the block.Global scopeGlobal scope specifies that variables defined outside the block are visible up to end of the program.Example#include int r= 50; /* global area */ main (){ int p = 30; printf (“p=%d, r=%d” p, r); fun (); } fun (){ printf (“r=%d”, r); }Outputp =30, r = 50 r = 50Scope rules related to functionsA Function is a block of statements that performs a particular task.Variables that are declared within the body of a function ... Read More
Global scopeGlobal scope specifies that variables defined outside the block are visible up to end of the program.Example#include int c= 30; /* global area */ main (){ int a = 10; printf (“a=%d, c=%d” a, c); fun (); } fun (){ printf (“c=%d”, c); }Outputa =10, c = 30 c = 30Local scopeLocal scope specifies that variables defined within the block are visible only in that block and invisible outside the block.Variables declared in a block or function (local) are accessible within that block and does not exist outside it.Example#include main (){ int i = ... Read More