How to Append a Character to beginning of a String in C - Step by Step Examples

How to Append a Character to beginning of a String in C ?

Answer

To append a character to the beginning of a string in C, you can use the strcpy and memmove functions from the string.h library.

✐ Examples

1 Append Character 'H' to the Beginning of the String "World"

In this example,

We include the necessary header string.h for string handling functions.
We create a character array named str with a string value and an array new_str with a size large enough to hold the original string plus one additional character.
We specify the character to be appended to the beginning.
We use the memmove function to shift the original string by one position to the right.
We place the new character at the beginning of the new string.
We copy the modified string back to the original string using strcpy.
Finally, we print the modified string to the standard output.

C Program

#include <stdio.h>
#include <string.h>

int main() {
    char str[50] = "World";
    char new_str[50];
    char ch = 'H';

    // Move the original string one position to the right
    memmove(new_str + 1, str, strlen(str) + 1);

    // Place the new character at the beginning
    new_str[0] = ch;

    // Copy the modified string back to the original string
    strcpy(str, new_str);

    printf("Modified string: %s\n", str);
    return 0;
}

Output

Modified string: HWorld

2 Append Character 'H' to the Beginning of the String "ello"

In this example,

We include the necessary header string.h for string handling functions.
We create a character array named str with a different string value and an array new_str with a size large enough to hold the original string plus one additional character.
We specify another character to be appended to the beginning.
We use the memmove function to shift the original string by one position to the right.
We place the new character at the beginning of the new string.
We copy the modified string back to the original string using strcpy.
Finally, we print the modified string to the standard output.

C Program

#include <stdio.h>
#include <string.h>

int main() {
    char str[50] = "ello";
    char new_str[50];
    char ch = 'H';

    // Move the original string one position to the right
    memmove(new_str + 1, str, strlen(str) + 1);

    // Place the new character at the beginning
    new_str[0] = ch;

    // Copy the modified string back to the original string
    strcpy(str, new_str);

    printf("Modified string: %s\n", str);
    return 0;
}

Output

Modified string: Hello

Summary

In this tutorial, we learned How to Append a Character to beginning of a String in C language with well detailed examples.

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