String Exercises
Write a C program to read any string from user and remove first occurrence of a given character from the string. The program should also use the concept of functions to remove the given character from string. How to remove first occurrences of a given character from the string.
Required knowledge
Basic C programming, C for loop, Array, functions, Strings
Logic to remove first occurrence of a character in string
Below is the step by step descriptive logic to remove first occurrence of a character in a 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 first occurrence of the given character toRemove in str.
- From the first occurrence of given character in string, shift next characters one place to its left.
Program to remove first occurrence of character
/**
* C program to remove first occurrence of a character from the given string.
*/
#include <stdio.h>
#include <string.h>
#define MAX_SIZE 100 // Maximum string size
/* Function declaration */
void removeFirst(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();
removeFirst(str, toRemove);
printf("String after removing first '%c' : %s", toRemove, str);
return 0;
}
/**
* Function to remove first occurrence of a character from the string.
*/
void removeFirst(char * str, const char toRemove)
{
int i = 0;
int len = strlen(str);
/* Run loop till the first occurrence of the character is not found */
while(i<len && str[i]!=toRemove)
i++;
/* Shift all characters right to the position found above, to one place left */
while(i < len)
{
str[i] = str[i+1];
i++;
}
}
