C Program to Copy One String to Another String.

In C programming, strings are sequences of characters that end with a null character ('\0'). Copying one string to another is a common task, and there are different approaches to achieving this.

In this article, we will explore three methods to copy one string to another and provide examples for each approach.

Approach 1: Using a loop.

One of the simplest ways to copy a string is to use a loop that iterates through each character of the source string and assigns them to the corresponding positions in the destination string until the null character is encountered.

Below is the C program for the above approach:

// C program copy one string to another string using loop
#include <stdio.h>

void copyString(char source[], char destination[]) {
    int i = 0;

    while (source[i] != '\0') {
        destination[i] = source[i];
        i++;
    }
    // Don't forget to add the null character at the end
    destination[i] = '\0'; 
}

int main() {
    char source[] = "Hello, World!";
    char destination[100]; 

    //function call
    copyString(source, destination);

    printf("Source string: %s\n", source);
    printf("Copied string: %s\n", destination);

    return 0;
}

Output:

Source string: Hello, World!
Copied string: Hello, World!

Approach 2: Using strlen() Function.

C provides a built-in function called strcpy() from the <string.h> library that can be used to copy one string to another. This function takes two arguments: the destination string and the source string.

Below is the C program for the above approach to copy string:

// C program copy one string to another string using strcpy
#include <stdio.h>
#include <string.h>

int main() {
    char source[] = "Hello, Algolesson!";
    char destination[100];
    
    //built-in function to copy string
    strcpy(destination, source);

    printf("Source string: %s\n", source);
    printf("Copied string: %s\n", destination);

    return 0;
}

Output:

Source string: Hello, Algolesson!
Copied string: Hello, Algolesson!

Approach 3: Using Pointer Notation

In this approach we will use pointers, pointers provide another way to copy strings. By using pointer notation, we can copy characters from the source to the destination until the null character is encountered.

Below is the C code implementation to copy string using a pointer:

// C program copy one string to another string using pointer
#include <stdio.h>

// function to copy string using pointer.
void copyString(char *source, char *destination) {

    while (*source != '\0') {
        *destination = *source;
        source++;
        destination++;
    }
    *destination = '\0';
}

int main() {
    char source[] = "Hello Coder!";
    char destination[100];

    copyString(source, destination);

    printf("Source string: %s\n", source);
    printf("Copied string: %s\n", destination);

    return 0;
}

Output:

Source string: Hello Coder!
Copied string: Hello Coder!

C Program to Copy One String to Another String.

Approach 1: Using a loop.

Approach 2: Using strlen() Function.

Approach 3: Using Pointer Notation

No comments:

Post a Comment