C program to trim leading white spaces from String
Given string str, the task is to write C program to remove leading space from the given string.
Examples :
Input: str = ” geeksforgeeks”
Output: geeksforgeeksInput: str = “gfg”
Output: gfg
Approach: The idea is to count the leading spaces in the given string and then from that count index copy the characters from that index to the front of the string. Below are the steps:
- Initialize count = 0 to count the number of leading spaces.
- Iterate through given string and find the index(say idx) at which the leading space character ends.
- Iterate through all the characters from that index idx and copy each character from this index to the end to the front index.
- Finally, put ‘\0’ at the last index of the new string to terminate the string.
Below is the implementation of the above approach:
C
// C program for the above approach#include <stdio.h> // Function to remove leading// spaces from a given stringchar* removeLeadingSpaces(char* str){ static char str1[99]; int count = 0, j, k; // Iterate String until last // leading space character while (str[count] == ' ') { count++; } // Putting string into another // string variable after // removing leading white spaces for (j = count, k = 0; str[j] != '\0'; j++, k++) { str1[k] = str[j]; } str1[k] = '\0'; return str1;} // Driver Codeint main(){ // Given string char str[] = " geeksforgeeks"; char* ptr; // Function call ptr = removeLeadingSpaces(str); // Print string without leading space printf("%s", ptr); return 0;} |
Output:
geeksforgeeks
Time Complexity: O(N)
Auxiliary Space: O(N)
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