C program to Replace last occurrence of character in string

By | 10.11.2016

Replace last occurrence of character in string


Write a C program to Replace last occurrence of character in string. Here’s simple C program to Replace last occurrence of character in string in C Programming Language.


C – Strings : 


Strings are actually one-dimensional array of characters terminated by a null character ‘\0’. Thus a null-terminated string contains the characters that comprise the string followed by a null.

String is a sequence of characters. char data type is used to represent one single character in C. So if you want to use a string in your program then you can use an array of characters.

The declaration and definition of the string using an array of chars is similar to declaration and definition of an array of any other data type.

Any string ends with a terminating null character ‘\0’. An array definition in such a way should include null character ‘\0’ as the last element.


Here is source code of the C program to Replace last occurrence of character in string. The C program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.


SOURCE CODE : :


/*  C program to Replace last occurrence of character in string  */

#include <stdio.h>
#define MAX_SIZE 100 //Maximum size of the string


/* Function declaration */
void replaceLast(char * string, char toReplace, char replaceWith);



int main()
{
    char string[MAX_SIZE], toReplace, replaceWith;

    printf("\nEnter any string: ");
    gets(string);

    printf("\nEnter character to replace: ");
    scanf(" %c", &toReplace);

    printf("\nEnter character to replace '%c' with: ", toReplace);
    scanf(" %c", &replaceWith);


    printf("\nString before replacing: %s\n", string);

    replaceLast(string, toReplace, replaceWith);

    printf("\nString after replacing: %s\n", string);

    return 0;
}




/**
 * Replaces the last occurrence of a character
 * with another in given string.
 */
void replaceLast(char * string, char toReplace, char replaceWith)
{
    int i, index;

    index = -1;
    i = 0;

    /* Runs till the end of string */
    while(string[i] != '\0')
    {
        /* If an occurrence of character is found */
        if(string[i] == toReplace)
        {
            index = i;
        }

        i++;
    }

    if(index != -1)
    {
        string[index] = replaceWith;
    }
}

Output:


/*  C program to Replace last occurrence of character in string  */

Enter any string: This is a test Program.

Enter character to replace: t

Enter character to replace 't' with: p

String before replacing: This is a test Program.

String after replacing: This is a tesp Program.

Process returned 0

Above is the source code for C program to Replace last occurrence of character in string which is successfully compiled and run on Windows System.The Output of the program is shown above .

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