How To Change Characters In A String C++

C program to replace all occurrences of a character with another in a cord – In this article, we will discuss the multiple means to supersede all occurrences of a grapheme with another in a string in C programming.

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Suitable examples and sample programs take also been added so that you lot can sympathise the whole affair very conspicuously. The compiler has also been added with which you can execute it yourself.

The ways described in this slice are equally follows:

Using Standard Model
Using Function
Using Recursion

A string is zilch but an array of characters. The value of a string is determined by the terminating graphic symbol. Its value is considered to be 0.

As we can see with this case, a string is to be entered start upwardly.

The string entered here is "howdy world"

We need to specify which character needs to be replaced with what.

The character 'o' has been replaced here with '0'.

So, subsequently replacing, the string became:

"hell0 w0rld"

Thus, the methods used to do and so in C programming are as follows:

Using Standard Method

Read the entered string using gets(south) function and store the string into the variable 'due south'.

2)Read the graphic symbol which we desire to replace all its occurrences in the cord and store in the variable c1.

3)Read the character by which we supplant all occurrences of the element, shop in the variable c2.

4)The for loop iterates through the string until the concluding character of the string becomes to cypher.

replace each occurrence of the graphic symbol c1 with c2.

five)Print the string afterward replacing all occurrences of the grapheme with another character in the string.

#include <stdio.h>

#include <cord.h>

int main ( )

{

char s [ yard ] , c1 , c2 ;

int i ;

printf ( "Enter the string : " ) ;

gets ( due south ) ;

printf ( "Enter a character supersede: " ) ;

c1 = getchar ( ) ;

getchar ( ) ;

printf ( "\nEnter character to replace with %c : " , c1 ) ;

c2 = getchar ( ) ;

printf ( "\n before replace:%s" , s ) ;

for ( i = 0 ; s [ i ] ; i ++ )

{

if ( s [ i ] == c1 )

{

due south [ i ] = c2 ;

}

printf ( "\nafter replace:%due south" , s ) ;

render 0 ;

}

Output:

Enter the string : hello world

Enter a graphic symbol supersede : fifty

Enter the string : hi world

Enter a character supersede : o

Enter character to supervene upon with o : 0

before replace : how-do-you-do globe

after replace : hell0 w0rld

Using Part

The chief() function calls the replacechar(char *s, char c1, char c2) function to replace all occurrences of the character with another grapheme.

two)Supersede c1 with c2 for each occurrence of the character c1 in the string using the for loop which iterates through the cord until the end of the string with the construction for(i=0;s[i];i++).

iii)Print the cord after replacing all occurrences of the character with another character.

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#include <stdio.h>

#include <cord.h>

void replacechar ( char * south , char c1 , char c2 )

{

int i = 0 ;

for ( i = 0 ; due south [ i ] ; i ++ )

{

if ( s [ i ] == c1 )

{

s [ i ] = c2 ;

}

int main ( )

{

char s [ one thousand ] , c1 , c2 ;

printf ( "Enter the string : " ) ;

gets ( s ) ;

printf ( "Enter a character supervene upon: " ) ;

c1 = getchar ( ) ;

getchar ( ) ;

printf ( "\nEnter character to replace with %c : " , c1 ) ;

c2 = getchar ( ) ;

printf ( "\due north before replace:%s" , s ) ;

replacechar ( due south , c1 , c2 ) ;

printf ( "\nafter supervene upon:%s" , s ) ;

render 0 ;

}

Output:

Enter the cord : hello world

Enter a character supplant : l

Enter character to supervene upon with l : i

before replace : hello world

after supplant : heiio worid

Using Recursion

The main() function calls the stringlength(char *due south) role which returns the length of the cord.

2)The master() role calls the recursive function replacechar(char *s, char c1, char c2) to replace all occurrences of the grapheme with another character.

iii) a)i=0.If the character at s[i] is null then leave from the part.

b)If it is not null then compare s[i] with the character c1. If it matches then supervene upon south[i] with c2.

Compare s[i] with the grapheme c1.If information technology matches then replace due south[i] with c2.

Increment the i value to search for the next occurrence and call the office itself.

4)The function calls itself until the last grapheme of the string.

5)The main() office prints the string later on replacing all occurrences of the character with some other graphic symbol.

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#include <stdio.h>

#include <string.h>

int stringlength ( char * s )

{

int j ;

for ( j = 0 ; due south [ j ] ; j ++ ) ;

render j ;

}

void replacechar ( char * due south , char c1 , char c2 )

{

static int i = 0 ;

if ( ! southward [ i ] )

render ;

if ( due south [ i ] == c1 )

s [ i ] = c2 ;

i ++ ;

replacechar ( s , c1 , c2 ) ;

}

int main ( )

{

char due south [ 1000 ] , c1 , c2 ;

printf ( "Enter the string : " ) ;

gets ( s ) ;

printf ( "Enter a character replace: " ) ;

c1 = getchar ( ) ;

getchar ( ) ;

printf ( "\nEnter character to supercede with %c : " , c1 ) ;

c2 = getchar ( ) ;

printf ( "\northward before supercede:%south" , s ) ;

replacechar ( s , c1 , c2 ) ;

printf ( "\nafter replace:%southward" , s ) ;

return 0 ;

}

Output:

Enter the string : welcome to c beginners

Enter a graphic symbol replace : e

Enter character to replace with e : Due east

before supercede : welcome to c beginners

after replace : wElcomE to c bEginnErs