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C program to Remove leading and trailing white spaces in a string

robaa
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2022-11-24
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Write a C program to Remove leading and trailing white spaces in a string. Here’s simple C program to Remove leading and trailing white spaces in a string in C Programming Language.

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robaa
2022-11-24
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C – Strings : 

Strings are actually one-dimensional array of characters terminated by a null character ‘\0’. Thus a null-terminated string contains the characters that comprise the string followed by a null.

 
 

String is a sequence of characters. char data type is used to represent one single character in C. So if you want to use a string in your program then you can use an array of characters.

The declaration and definition of the string using an array of chars is similar to declaration and definition of an array of any other data type.

Any string ends with a terminating null character ‘\0’. An array definition in such a way should include null character ‘\0’ as the last element.

 

Here is source code of the C program to Remove leading and trailing white spaces in a string. The C++ program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

SOURCE CODE : :

/*  C program to Remove leading and trailing white spaces in a string  */

#include <stdio.h>
#define MAX_SIZE 100 //Maximum size of the string


/* Function declaration */
void trimT(char * string);



int main()
{
    char string[MAX_SIZE];

    /* Reads string from user */
    printf("\nEnter any string: ");
    gets(string);

    printf("\nString before trimming whitespace: "%s"\n", string);

    trim(string);

    printf("\nString after trimming whitespace: "%s"\n", string);

    return 0;
}




/**
 * Remove leading and trailing whitespace characters from a string
 */
void trim(char * string)
{
    int lastIndex, lastSpaceIndex, i, j;

    /*
     * Trims leading white spaces
     */
    lastSpaceIndex = 0;

    /* Finds the last index of whitespace character */
    while(string[lastSpaceIndex] == ' ' || string[lastSpaceIndex] == '\t' || string[lastSpaceIndex] == '\n')
    {
        lastSpaceIndex++;
    }


    /* Shits all trailing characters to its left */
    i = 0;
    while(string[i + lastSpaceIndex] != '\0')
    {
        string[i] = string[i + lastSpaceIndex];
        i++;
    }
    string[i] = '\0'; //Make sure that string is NULL terminated



    /*
     * Trims trailing white spaces
     */

    /* Finds the last non white space character */
    i = 0;
    while(string[i] != '\0')
    {
        if(string[i] != ' ' && string[i] != '\t' && string[i] != '\n')
        {
            lastIndex = i;
        }

        i++;
    }

    /* Mark the next character to last non white space character as NULL */
    string[lastIndex + 1] = '\0';
}

Output : :

/*  C program to Remove leading and trailing white spaces in a string  */

Enter any string: Hi   Friends,   What's    Uo?

String before trimming whitespace: "Hi   Friends,   What's    Uo?"

String after trimming whitespace: "Hi   Friends,   What's    Uo?"

Process returned 0

Above is the source code for C program to Remove leading and trailing white spaces in a string which is successfully compiled and run on Windows System.The Output of the program is shown above .

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