String Exercises
Write a C program to read any string from user and remove last occurrence of a given character from the string. How to remove the last occurrence of a character from string in C programming. Logic to remove last occurrence of a character from the string.
Required knowledge
Basic C programming, C for loop, Array, functions, Strings
Logic to remove last occurrence of a character
Below is the step by step descriptive logic to remove last occurrence of a character in given string.
- Input string from user, store it in some variable say str.
- Input character to remove from user, store it in some variable say toRemove.
- Find last occurrence of the given character toRemove in str.
- From the last occurrence of given character in string, shift next characters one place to its left.
Program to remove last occurrence of character
/**
* C program to remove last occurrence of a character from the given string.
*/
#include <stdio.h>
#include <string.h>
#define MAX_SIZE 100 // Maximum string size
/* Function declaration */
void removeLast(char *, const char);
int main()
{
char str[MAX_SIZE];
char toRemove;
printf("Enter any string: ");
gets(str);
printf("Enter character to remove from string: ");
toRemove = getchar();
removeLast(str, toRemove);
printf("String after removing last '%c' : %s", toRemove, str);
return 0;
}
/**
* Function to remove last occurrence of a character from the string.
*/
void removeLast(char * str, const char toRemove)
{
int i, lastPosition;
int len = strlen(str);
/* Assume that character does not exist in string */
lastPosition = -1;
i=0;
while(i<len)
{
if(str[i] == toRemove)
{
lastPosition = i;
}
i++;
}
/* If character exists in string */
if(lastPosition != -1)
{
i = lastPosition;
/*
* Shift all characters right to the position found above to left
*/
while(i<len)
{
str[i] = str[i+1];
i++;
}
}
}
