Copying Strings in C: Exploring strcpy and strncpy Functions
String Copying in C: A Guide to strcpy and strncpy Functions
To design a function to copy a string into a destination string using strcpy() and strncpy() in C, we can use the following steps:
Declare the function prototype.
This tells the compiler the name of the function, the number and types of its parameters, and the type of its return value.
C Programming
void copy_string(char *dest, const char *src);Implement the function body.
This is where we write the code that actually copies the string from the source string to the destination string.
C Programming
void copy_string(char *dest, const char *src) {
// Check if the destination string is NULL.
if (dest == NULL) {
return;
}
// Check if the source string is NULL.
if (src == NULL) {
return;
}
// Copy the string from the source string to the destination string.
// We use strcpy() if we want to copy the entire string, or strncpy() if
// we only want to copy a certain number of characters.
strcpy(dest, src);
}Call the function.
To call the function, we pass the destination string and the source string as parameters.
C Programming
char dest[100];
const char *src = "This is a test string.";
copy_string(dest, src);Complete example of a function to copy a string into a destination string using strcpy() and strncpy() in C:
C Programming
#include <stdio.h>
#include <string.h>
void copy_string(char *dest, const char *src);
int main() {
char dest[100];
const char *src = "This is a test string.";
copy_string(dest, src);
printf("The copied string is: %s\n", dest);
return 0;
}
void copy_string(char *dest, const char *src) {
// Check if the destination string is NULL.
if (dest == NULL) {
return;
}
// Check if the source string is NULL.
if (src == NULL) {
return;
}
// Copy the string from the source string to the destination string.
strcpy(dest, src);
}Output:
The copied string is: This is a test string.Further Reading:
Implementation of strncat() in C
add source string at the end of destination string
comparing two string using strcmp and strncmp
Design a function to copy to copy string into destination string using strcpy and strncpy
how to implement implementation of strncpy in c
Design a function to calculate the length of the string using strlen
pre defined string based function
Design a function using my_strcpy and using my_strchr we need to select given char in given string
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