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Why does ISO C forbid converting a string constant to 'char' in C?
ISO C forbids converting a string constant to 'char' in C because string constants are read-only and attempting to modify them through a 'char' pointer can lead to undefined behavior and potential program crashes.
C program for reversing a string?
#include <stdio.h> #include <string.h> int main() { char a[20],arev[20]; int i,len; printf("Enter a string: "); scanf("%s",a); len=strlen(a); for(i=0;i<len;i++) { arev[len-1-i]=a[i]; } arev[len]='\0'; printf("\nReverse of %s is %s",a,arev); return 0; }
What is the difference between numeric and string variables?
Numeric variables store numbers for doing mathematics, counting etc.. String variables store printable sets of characters that can be read by humans in what ever language. int i=3; /* a numeric variable in c */ char *hello = "Hello world, Im 3 years old" /* string that contains a number */ Computer languages generally provide many different ways to transform one into the other.
How do you compare strings?
In most programming languages you will be relying on pre-existing library functions for all your string comparison needs.The algorithm is:Consider both strings as arrays of characters (depending on the language, they will either have a specified maximum length, eg in Pascal or a terminating symbol - usually a zero - eg in C and C++)Iterator n represents the position in the character string, with its' initial value representing the first index in the array. If the language permits it, you can use pointer arithmetic instead.For each character in a string:Take the n-th character from string 1Take the n-th character from string 2Compare both characters (the exact comparison method may vary)If not equal, return falseIncrease n by 1If reached end of string, return trueHere is an example function in C (returning a 1 if the strings are identical, 0 if not). This implementation forgoes use of an iterator in favor of pointer arithmetic and comparison in favor of XORing the characters with each other (a XOR of identical values returns a zero):int string_compare(char* a, char* b){while (*a){if (*a++^*b++) return 0;}return 1;}
What is mean of cast operator?
A cast operator explicitly converts a value to the specified data type. The following are common cast operators in C. (int) (char) (string) *i'm not completely sure this is the one for string* Placing any of these cast operators in front of any variable or expression will convert its value to the specified type. If you have the number 4 stored as a character in the variable x, then you may use the cast (int) so that the number will be seen as an integer value for mathematical operations. See below: int main() { char x = 4; int answer; // Perform the operation, 5 - x // You may be tempted to use the following code to perform the operation: answer = 5 - x; //Doing this will result in a garbage value for answer. //The following will give the proper answer answer = 5 - (int)x; }
Why does ISO C forbid converting a string constant to 'char' in C?
ISO C forbids converting a string constant to 'char' in C because string constants are read-only and attempting to modify them through a 'char' pointer can lead to undefined behavior and potential program crashes.
How string constants are declared in c?
Some strings are constants, others aren't; some constants are strings, other aren't. So these are unrelated things. Examples: "text" -- constant string 123 -- constant number char s[40] -- variable string
How do you convert char to String in java?
A String is nothing but a bunch of characters one after the other whereas a character has a size of only '1' So converting a string into a char is not possible. what you can do is form a character based on only one element from the string. Ex: String name = "Rocky"; char xyz = name.charAt(0); now the char xyz will have one character from the String.
What are string literals?
A string literal is a sequence of characters, including backslash-escaped codes, between two double-quote characters. These are of type const char*, such that the character values are immutable (cannot be changed after creation). "Hello my little minions" is a string constant, for instance.Note that under C you can pass const char* types as char* in function parameters, or assign values between constant and non-constant types, but C++ will issue warnings if you attempt to do as such (unless those warnings have been disabled, which may not be recommended).
What is the difference between string type and character type constants?
A character type constant is a character, a char, while a string type is an array of characters. The character type constant is one character and is delimited by single quotes. The string type constant is zero or more characters and is delimited by double quotes.
C prog to concatenate two string without using buid in function?
//String Concatination#include#includeusing namespace std;char* strcat(char*,char*);int main(){char str1[100];char str2[100];coutstr1;coutstr2;cout
What is difference between multi character constant and string literals?
In C, you can assign integers multiple characters such that they fit in their size. For e.g.: int - 4 bytes char - 1 byte So an assignment like this is valid: int a = 'ABCD'; The first byte in a will be assigned the value of 'A', the second - 'B' and so on. A string literal is a character array constant. It is enclosed in double quotes and assignment can only be made to a char pointer. There is no limit on the size of the literal and it is terminated with a null character. e.g.: char str[] = "This is a trial";
How do you convert char to string?
Character.toString('c')
C plus plus programs - to replace every space in a string with a hyphen?
char *string = "this is a test"; char *p; for (p=string; *p!='\0'; p++) if (*p==' ') *p='-';
What is the difference between string and char array?
3 differences.................. 1. length wise.... 2.initialization 3. null terminated length of char array is differ from string........ initialization of string is differ from char....... and string is null terminated...........
Write a function for concatnating the string s1 s2 and storing the result in string s3?
char *strmerge (char *s3, const char *s1, const char *s2) { strcpy (s3, s1); strcat (s3, s2); return s3; }
How does a 'string' type string differ from a c-type string?
A char is a single character. A String is a collection of characters. It may be empty (zero characters), have one character, two character, or many characters - even a fairly long text.The single quote (') is used to deliniate a character during assignment:char someChar = 'a';The double quote (") is used to delineate a string during assignment:String someString = new String("hello there");Note that char is a primitive data type in Java, while String is an Object. You CANNOT directly assign a char to a String (or vice versa). There is, however, a Character object that wraps the char primitive type, and Java allows method calls to be made on the char primitive (automagically converting the char to Character before doing so).i.e. these ALL FAIL:someString = SomeChar;someString = new String(someChar);However, these WILL work:someString = Character.toString(someChar);someString = someChar.toString();Also note that a String is a static memory allocation, while a character's is dynamic. By that, I mean that when a String is created, it is allocated a memory location exactly big enough to fit the assigned string. Any change to that String forces and entirely new memory location to be allocated, the contents of the old String copied in (with the appropriate changes), and the old String object subject to garbage collection. Thus, making changes to a String object are quite inefficient (if you want that kind of behaviour, use StringBuffer instead).A character is allocated but once; all subsequent changes to a character variable simply overwrite that same memory location, so frequent changes to a character variable incur no real penalty.
