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
printf("\n The Last Occurrence of the Search Element '%c' is at Position %d ", ch, i + 1);C Program to Remove Last Occurrence of a Character in a String Example 2
This program is same as above. Here, we just replaced the For Loop with While Loop. I suggest you to refer While Loop to understand the Loop iterations.
/* 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;
i = 0;
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);
while(i < len)
{
if(str[i] == ch)
{
index = i;
}
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
C Program to Remove Last Occurrence of a Character in a String Example 3
This program is same as first example, but this time we used the Functions concept to separate the logic.
/* C Program to Remove Last Occurrence of a Character in a String */
#include <stdio.h>
#include <string.h>
void Remove_LastOccurrence(char *str, char ch);
int main()
{
char str[100], ch;
printf("\n Please Enter any String : ");
gets(str);
printf("\n Please Enter the Character that you want to Search for : ");
scanf("%c", &ch);
Remove_LastOccurrence(str, ch);
printf("\n The Final String after Removing Last Occurrence of '%c' = %s ", ch, str);
return 0;
}
void Remove_LastOccurrence(char *str, char ch)
{
int i, index, len;
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++;
}
}
}OUTPUT
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