C Program to Remove Last Occurrence of a Character in a String

In this article, we will show you, How to write a C Program to Remove Last Occurrence of a Character in a String with example.

C Program to Remove Last Occurrence of a Character in a String Example 1

This program allows the user to enter a string (or character array), and a character value. Next, it will find and remove last occurrence of a character inside a string.

/* C Program to Remove Last Occurrence of a Character in a String */

#include <stdio.h>

#include <string.h>

int main()

{

char str[100], ch;

int i, index, len;

index = -1;

printf("\n Please Enter any String : ");

gets(str);

printf("\n Please Enter the Character that you want to Search for : ");

scanf("%c", &ch);

len = strlen(str);

for(i = 0; i < len; i++)

{

if(str[i] == ch)

{

index = i;

}

if(index != -1)

{

i = index;

while(i < len)

{

str[i] = str[i + 1];

i++;

}

printf("\n The Final String after Removing Last Occurrence of '%c' = %s ", ch, str);

return 0;

}

OUTPUT

ANALYSIS

First we used For Loop to iterate each and every character in a String. Within the loop, we are checking whether the individual character is equal to user specified character or not. If True, then we are assigning i value to index variable.

for(i = 0; i < len; i++)

{

if(str[i] == ch)

{

index = i;

}

Next, we used the If Statement to check the index value is not equal to -1. If it is True then compiler will shift the characters

str[] = tutorial

ch = t

Index = -1

For Loop First Iteration: for(i = 0; i < len; i++)

The condition is True because 0 < 8.

Within the While Loop we used If Statement to check whether the str[0] is equal to user specified character or not

if(str[i] == ch) => if(t == t)

Above condition is True. So,

index = i = 0.

Second Iteration: for(i = 1; 1 < 8; 1++)

if(str[1] == ch) => if(u == l)

Above condition is false. So, i value will be incremented.

Third Iteration: for(i = 2; 2 <= 5; 2++)

if(str[i] == ch) => if(t == t)

Above condition is True.

Index = i

index = 2

Do the same for remaining iterations.

Next, we used the If Statement to check the index value is not equal to -1. Here, the condition is True so, i = index

i = 2

While Loop First Iteration: while(i < len)

=> while(2 < 8) – Condition is True

str[i] = str[i + 1]

str[2] = str[3]

str[2] = o

i will be incremented

Second Iteration: while(3 < 8)

str[3] = str[4]

str[3] = r

i will be incremented

Third Iteration: while(4 < 8)

str[4] = str[5]

str[4] = i

i will be incremented

Do the same for remaining iterations until i becomes 8.

At last we used the printf statement to print the final string

1	printf("\n The Last Occurrence of the Search Element '%c' is at Position %d ", ch, i + 1);